Exhibit 2.11
                                                                    ------------




                            STOCK PURCHASE AGREEMENT

                             dated January 25, 2002

                                     between

                             REDWOOD WEST COAST, LLC

                                       and

                             SYNBIOTICS CORPORATION



                                TABLE OF CONTENTS


                                                                                              
ARTICLE 1. DEFINED TERMS ....................................................................     1
ARTICLE 2. PURCHASE AND SALE TERMS ..........................................................     3
        Section 2.1 Purchase and Sale .......................................................     3
        Section 2.2 Transfer Legends and Restrictions .......................................     3
ARTICLE 3. REPRESENTATIONS AND WARRANTIES OF SYNBIOTICS .....................................     4
        Section 3.1 Corporate Existence .....................................................     4
        Section 3.2 Power and Authority .....................................................     4
        Section 3.3 Financial Condition .....................................................     5
        Section 3.4 Absence of Certain Changes ..............................................     6
        Section 3.5 Litigation ..............................................................     7
        Section 3.6 Licenses; Compliance with Laws, Other Agreements, etc ...................     8
        Section 3.7 Brokers, etc ............................................................    11
        Section 3.8 Private Sale ............................................................    11
        Section 3.9 Reports .................................................................    12
        Section 3.10 Investigation ..........................................................    12
        Section 3.11 Section 83(b) Elections ................................................    12
        Section 3.12 Employment Contracts, etc.; Certain Material Transactions ..............    13
        Section 3.13 Contracts and Commitments, etc .........................................    13
        Section 3.14 Employee Plans .........................................................    13
        Section 3.15 Banks, Agents, etc .....................................................    15
        Section 3.16 Minute Books ...........................................................    15
        Section 3.17 Environmental Liabilities ..............................................    16
        Section 3.18 Maintenance of Corporate Existence .....................................    16
ARTICLE 4. COVENANTS OF SYNBIOTICS ..........................................................    16
        Section 4.1 Proprietary Information .................................................    16
        Section 4.2 Licenses and Trademarks .................................................    17
        Section 4.3 Liability Insurance .....................................................    17
        Section 4.4 Taxes and Assessments ...................................................    17
        Section 4.5 Governmental Consents ...................................................    17
        Section 4.6 Further Assurances ......................................................    17
        Section 4.7 Expenses ................................................................    18
        Section 4.8 Negative Covenants in Effect as Long as Preferred Stock is Outstanding ..    18
        Section 4.9 Negative Covenants in Effect until Closing ..............................    18
        Section 4.10 Additional Common Stock ................................................    19
        Section 4.11 Other Transactions .....................................................    19
        Section 4.12 Consulting Fees ........................................................    19
        Section 4.13 Amendment to Rights Agreement ..........................................    19
        Section 4.14 Waiver .................................................................    20
        Section 4.15 Additional Shares ......................................................    20
ARTICLE 5. REPRESENTATIONS AND WARRANTIES OF REDWOOD ........................................    21
        Section 5.1 Power and Authority .....................................................    21
        Section 5.2 Purchase for Investment .................................................    21
        Section 5.3 Financial Matters .......................................................    21





                                                                                     
        Section 5.4 Brokers, etc ....................................................   21
ARTICLE 6. THE CLOSING AND CLOSING CONDITIONS .......................................   21
        Section 6.1 The Closing .....................................................   21
        Section 6.2 Issuance of Preferred Stock .....................................   22
        Section 6.3 Legal Opinion from Counsel for Synbiotics .......................   22
        Section 6.4 Representations and Warranties of Synbiotics True and Correct ...   22
        Section 6.5 Employee Documents ..............................................   22
        Section 6.6 Redwood Review ..................................................   22
        Section 6.7 Certificate of Determination ....................................   23
        Section 6.8 Opinion .........................................................   23
        Section 6.9 Performance .....................................................   23
        Section 6.10 All Proceedings to Be Satisfactory .............................   23
        Section 6.11 Supporting Documents ...........................................   23
        Section 6.12 Reasonable Satisfaction of Redwood and Counsel .................   24
        Section 6.13 Financing ......................................................   24
        Section 6.14 Reconstitution of Board of Directors ...........................   24
ARTICLE 7. MISCELLANEOUS ............................................................   24
        Section 7.1 Severability ....................................................   24
        Section 7.2 Parties in Interest .............................................   25
        Section 7.3 Notices .........................................................   25
        Section 7.4 No Waiver .......................................................   26
        Section 7.5 Survival of Agreements, etc .....................................   26
        Section 7.6 Construction ....................................................   26
        Section 7.7 Entire Understanding ............................................   26
        Section 7.8 Counterparts ....................................................   26
        Section 7.9 Assignment; No Third-Party Beneficiaries ........................   27
ARTICLE 8. TERMINATION ..............................................................   27
        Section 8.1 Termination .....................................................   27
        Section 8.2 Termination Pursuant to Section 4.11 ............................   27
        Section 8.3 Effect of Termination ...........................................   27


EXHIBITS

Exhibit 1.1 -   Certificate of Determination/(1)/
Exhibit 6.3 -   Legal Opinion
Exhibit 6.13 -  Third Amendment to Credit Agreement and Loan Documents and
                Waiver of Defaults/(2)/

(1)  Incorporated herein by reference to Exhibit 4.5 of this Current Report on
     Form 8-K.

(2)  Incorporated herein by reference to Exhibit 4.4.3 of this Current Report on
     Form 8-K.

                                      -ii-



                                                                    EXHIBIT 2.11

         This STOCK PURCHASE AGREEMENT ("Agreement") entered into this 25th day
of JANUARY, 2002, between REDWOOD WEST COAST, LLC, a Delaware limited liability
company ("Redwood"), and SYNBIOTICS CORPORATION, a California corporation
("Synbiotics").

         Redwood and Synbiotics desire to enter into this Agreement to provide
for the purchase by Redwood of a new issue of Preferred Stock of Synbiotics with
the characteristics set forth in a Certificate of Determination attached as
Exhibit 1.1 and to provide such other terms and conditions with respect to such
transaction as contained herein.

                            Article 1. Defined Terms

         The following terms, when used in this Agreement, have the following
meanings, unless the context otherwise indicates:

         "'33 Act" means the Securities Act of 1933.

         "'34 Act" means the Securities Exchange Act of 1934.

         "Affiliate" means, with respect to any specified Person, (1) any other
Person who, directly or indirectly, owns or controls, is under common ownership
or control with, or is owned or controlled by, such specified Person, (2) any
other Person who is a manager, director, officer or partner or is, directly or
indirectly, the beneficial owner of 10 percent or more of any class of equity
securities, of the specified Person or a Person described in clause (1) of this
paragraph, (3) another Person of whom the specified Person is a manager,
director, officer or partner or is, directly or indirectly, the beneficial owner
of 10 percent or more of any class of equity securities, (4) another Person in
whom the specified Person has a substantial beneficial interest or as to whom
the specified Person serves as trustee or in a similar capacity, or (5) any
relative or spouse of the specified Person or any of the foregoing Persons, any
relative of such spouse or any spouse of any such relative; provided, however,
that at any time after the Closing Date, Synbiotics and the Subsidiaries on the
one hand and Redwood and its Affiliates (other than Synbiotics and the
Subsidiaries) shall not be deemed to be Affiliates of each other.

         "Articles of Incorporation" means the articles of incorporation of
Synbiotics, as originally filed with the California Secretary of State together
with all amendments thereof (including certificates of determination) and
restatements thereof.

         "Best Knowledge" shall mean and include (a) actual knowledge of the
Person, including, the actual knowledge of any of the officers or directors of
Synbiotics and the administrators of any of the facilities operated by
Synbiotics or any of its subsidiaries and (b) that knowledge which a prudent
businessperson could have obtained in the management of his business after
making due inquiry, and after exercising due diligence, with respect thereto.

         "Bylaws" means the bylaws of Synbiotics, as amended.

         "Certificate of Determination" means the certificate of determination
(as amended) adopted by the Synbiotics board of directors establishing the
rights, limitations, etc., of the Preferred Stock.

                                       -1-



         "Closing" and "Closing Date" mean the consummation of Synbiotics'
issuance and sale and Redwood's purchase of the Preferred Stock, and the date on
which the same occurs or occurred.

         "Common Stock" means the common stock of Synbiotics.

         "Employee Plan" has the meaning set forth in Section 3.14.1 hereof.

         "Employee Retention Agreements" means agreements held by employees of
Synbiotics entitling them to certain payments in the event of a change in
control of Synbiotics.

         "Financial Statements" means any financial statements (including the
notes thereto) of Synbiotics certified by Synbiotics' independent public
accountants and any such statements not so certified but containing
substantially all the information covered in such certified statements,
including a balance sheet as of the end of a fiscal period and statements of
income and retained earnings and of sources and applications of funds for such
fiscal period, together with all notes thereto.

         "Financial Statements" shall mean all of the following:

                  (a) the audited financial statements of Synbiotics as of
         December 31, 2000 (including all schedules and notes thereto),
         consisting of the balance sheet at such date and the related statements
         of income and expenses, retained earnings, changes in financial
         position and cash flows for the twelve-month period then ended; and

                  (b) the unaudited financial statements of Synbiotics as of
         September 30, 2001 (including all schedules and notes thereto),
         consisting of the balance sheet at such date and the related statements
         of income and expenses, retained earnings, changes in financial
         position and cash flows for the nine-month period then ended.

In addition to (a) and (b) above, after the date of this Agreement, the term
"Financial Statements" shall include any and all interim financial statements
thereafter issued.

         "Financial Statement Date" means September 30, 2001.

         "Independent Public Accountants" means that firm of independent
certified public accountants selected by Synbiotics' Board of Directors with the
approval of the Redwood Board Members.

         "Person" means any natural person or entity including, but not limited
to, a corporation, partnership, or limited liability company.

         "Preferred Stock" means the Series B Preferred Stock of Synbiotics
having the characteristics set forth in the Certificate of Determination.

         "Redwood" means Redwood West Coast, LLC.

         "Redwood Board Members" means that individual or individuals (initially
Thomas Donelan and Christopher Hendy) who sit on Synbiotics' Board of Directors
at the request of Redwood.

         "SEC" means the United States Securities and Exchange Commission.

                                       -2-




         "Shares" means any shares of Synbiotics' Series B Preferred Stock or
Common Stock issued or issuable upon conversion thereof, as the context
requires.

         "Subsidiary" or "Subsidiaries" of any Person means any corporation or
other entity of which securities or other ownership interests having ordinary
voting power to elect a majority of the board of directors or other Persons
performing similar functions are at the time directly or indirectly owned or
controlled by such Person or one or more Subsidiaries of such Person.

         "Synbiotics" means Synbiotics Corporation, a California corporation.

         The masculine form of words includes the feminine and the neuter and
vice versa, and, unless the context otherwise requires, the singular form of
words includes the plural and vice versa. The words "herein," "hereof,"
"hereunder," and other words of similar import when used in this Agreement refer
to this Agreement as a whole, and not to any particular section or subsection.

                       Article 2. Purchase and Sale Terms

         Section 2.1 Purchase and Sale.
                     -----------------

         Subject to the terms of this Agreement, at the Closing Synbiotics shall
issue and sell to Redwood, and Redwood shall purchase from Synbiotics for
$2,800,000 cash, 2,800 shares of Series B Preferred Stock. Synbiotics represents
and warrants to Redwood that, as of immediately after the Closing, such Shares
will entitle Redwood to approximately fifty four and one-half percent of the
total voting power of all classes of stock of Synbiotics after giving effect to
the deemed issuance of (1) all shares of Common Stock called for by any and all
warrants, options, convertible notes, convertible securities and other
agreements of any nature of Synbiotics outstanding on the Closing Date calling
for the issuance of Common Stock at less than $1.99 per share plus (2) all
shares of Common Stock issuable on or before May 15, 2002 pursuant to amended
Employee Retention Agreements. In addition, Synbiotics shall issue additional
shares of Series B Preferred Stock to Redwood when, as and if required by
Section 4.15 hereof.

         Section 2.2 Transfer Legends and Restrictions.
                     ---------------------------------

         The transfer of the Shares will be restricted in accordance with the
terms hereof. Each certificate evidencing the Shares, including any certificate
issued to any transferee thereof, shall be imprinted with a legend in
substantially the following form:

         "THESE SHARES HAVE NOT BEEN REGISTERED UNDER THE '33 ACT. THEY MAY NOT
         BE OFFERED OR TRANSFERRED BY SALE, ASSIGNMENT, PLEDGE OR OTHERWISE
         UNLESS (1) A REGISTRATION STATEMENT FOR THE SHARES UNDER THE '33 ACT IS
         IN EFFECT OR (2) SYNBIOTICS HAS RECEIVED AN OPINION OF COUNSEL, WHICH
         OPINION IS REASONABLY SATISFACTORY TO SYNBIOTICS, TO THE EFFECT THAT
         SUCH REGISTRATION IS NOT REQUIRED UNDER THE '33 ACT.

                                       -3-



     Redwood, by acceptance of the Shares, agrees, so long as any legend
described in this Section shall remain on the certificates evidencing the
Shares, prior to any transfer of any of the same (except for a transfer effected
pursuant to an effective registration statement under the `33 Act or in
compliance with Rule 144 or Rule 144A thereunder), to give written notice to
Synbiotics of Redwood's intention to effect such transfer and agrees to comply
in all material respects with the provisions of this Section. Such notice, if
required, shall describe the proposed method of transfer of the Shares in
question. Upon receipt by Synbiotics of such notice, if required, and if in the
opinion of counsel to Redwood, which opinion shall be reasonably satisfactory to
Synbiotics, the proposed transfer may be effected without registration under the
`33 Act in compliance with Section 4(2) or Rules 144 or 144A thereunder and
under applicable state securities laws, then the proposed transfer may be
effected. Provided, however, that no such opinion of counsel shall be necessary
for a transfer by Redwood to a member or other Affiliate of Redwood, if the
transferee agrees in writing to be subject to the terms of this Section to the
same extent as if such transferee were originally a signatory to this Agreement.
Upon receipt by Synbiotics of such opinion and of such agreement by the
transferee to be bound by this Section, the holder of such Shares shall
thereupon be entitled to transfer the same in accordance with the terms of the
notice (if any) delivered by such holder to Synbiotics. Each certificate
evidencing the Shares issued upon any such transfer shall bear the legend set
forth in this Section. Upon the written request of Redwood or a subsequent
holder of the Shares, Synbiotics shall remove the foregoing legend from the
certificates evidencing such Shares and issue to such holder new certificates
therefor, free of any transfer legend if, with such request, Synbiotics shall
have received an opinion of counsel selected by the holder, such opinion to be
reasonably satisfactory to Synbiotics, to the effect that any transfers by said
holder of such Shares may be made to the public without compliance with either
Section 5 of the `33 Act or Rule 144 thereunder and applicable state securities
laws. In no event will such legend be removed if such opinion is based upon the
"private offering" exemption of Section 4(2) of the `33 Act.

             Article 3. Representations and Warranties of Synbiotics

     Except as set forth in the Disclosure Letter furnished by Synbiotics to
Redwood before the date of this Agreement, Synbiotics represents and warrants to
Redwood:

     Section 3.1 Corporate Existence.
                 -------------------

     Synbiotics is a corporation duly incorporated, validly existing and in good
standing under California law and has full power and authority to conduct its
business and own its properties as now conducted and owned. Synbiotics is
qualified as a foreign corporation to do business in all jurisdictions in which
the nature of its properties and business requires such qualification.

     Section 3.2 Power and Authority.
                 -------------------

     Synbiotics has full power and authority, and has taken all required
corporate and other action necessary to permit it to own and hold properties to
carry on its current business, to execute and deliver this Agreement, to issue
and sell the Preferred Stock as herein provided and otherwise to carry out the
terms of this Agreement and all other documents, instruments, or transactions
required by this Agreement, and none of such actions will violate any provision
of Synbiotics' Bylaws or Articles of Incorporation, or result in the breach of
or constitute a default under any agreement or instrument to which Synbiotics is
a party or by which it is bound or result in the creation or imposition of any
material lien, claim or encumbrance on any Synbiotics' asset. This Agreement has

                                       -4-



been duly executed and delivered by Synbiotics and constitutes the valid and
binding obligation of Synbiotics enforceable against Synbiotics in accordance
with its terms. No event has occurred and no condition exists which would
constitute a violation of this Agreement. Neither this Agreement nor any other
document gives any person rights to terminate any agreements with Synbiotics or
otherwise to exercise rights against Synbiotics.

         Section 3.3 Financial Condition.
                     -------------------

         Synbiotics has previously furnished to Redwood reports filed by
Synbiotics with the SEC (the "SEC Reports") containing its Financial Statements,
which, together with the footnotes thereto, are complete and correct, have been
prepared in accordance with generally accepted accounting principles
consistently applied, and fairly present the financial condition of Synbiotics
as of the dates specified. The Financial Statements are in accordance with the
books and records of Synbiotics as of the dates and for the periods indicated,
present fairly the financial position, results of operations, shareholders'
equity and changes in financial position of such corporations as of the
respective dates and for the respective periods indicated, and have been
prepared in accordance with generally accepted accounting principles ("GAAP")
applied on a consistent basis (except as described in such statements, notes
thereto and reports).

                  3.3.1 Absence of Undisclosed Liabilities. As of the Financial
                        ----------------------------------
         Statement Date, Synbiotics had no material liabilities (matured or
         unmatured, fixed or contingent), which are not fully reflected or
         provided for on the balance sheet of Synbiotics as at the Financial
         Statement Date, or any material loss contingency (as defined in
         Statement of Financial Accounting Standards No. 5) whether or not
         required by GAAP to be shown on the Balance Sheets, except (1)
         obligations to perform under commitments incurred in the ordinary
         course of business after the Financial Statement Date, (2) tax and
         related liabilities due and specifically set forth in the Disclosure
         Letter, which liabilities shall be fully paid concurrently with the
         Closing as provided in the Disclosure Letter, and (3) other liabilities
         as set forth in the Disclosure Letter.

                  3.3.2 Taxes. For all periods ended on or prior to the
                        -----
         Financial Statement Date, Synbiotics has accurately completed and filed
         or will file within the time prescribed by law (including extensions of
         time approved by the appropriate taxing authority) all tax returns and
         reports required to be filed with the Internal Revenue Service, the
         State of California, any other states or governmental subdivisions and
         all foreign countries and has paid, or made adequate provision in the
         Financial Statements dated the Financial Statement Date for the payment
         of, all taxes, interest, penalties, assessments or deficiencies shown
         to be due (or, to the Best Knowledge of Synbiotics, claimed by such
         authority or jurisdiction to be due) on or in respect of such tax
         returns and reports. Synbiotics knows of (1) no other federal,
         California, state, county, municipal or foreign taxes which are due and
         payable by Synbiotics which have not been so paid; (2) no other
         federal, California, state, county, municipal or foreign tax returns or
         reports which are required to be filed which have not been so filed;
         and (3) no unpaid assessment for additional taxes for any fiscal period
         or any basis thereof; except for taxes which are due and are
         specifically set forth in the Disclosure Letter hereto but which shall
         be paid in full concurrently with the Closing as provided in the
         Disclosure Letter. Synbiotics' federal or state income tax returns have
         never been audited. Proper and

                                       -5-



accurate amounts have been withheld by Synbiotics from its employees for all
periods in compliance with the tax, social security and any employment
withholding provisions of applicable federal and state law. Proper and accurate
federal and state returns have been filed by Synbiotics for all periods for
which returns were due with respect to employee income tax withholding, social
security and unemployment taxes, and the amounts shown thereon to be due and
payable have been paid in full or provision therefor included on the books of
Synbiotics in accordance with and to the extent required by GAAP. Synbiotics has
not made any election under Section 341(f) of the Internal Revenue Code of 1986,
as amended (the "Code").

         3.3.3 Subsidiaries. The Disclosure Letter hereto sets forth a list of
               ------------
all Subsidiaries of Synbiotics. Each Subsidiary is a corporation duly organized,
validly existing and in good standing under the laws of its jurisdiction of
incorporation as stated on the Disclosure Letter, has all requisite corporate
power and authority to own, lease and operate its properties and to carry on its
business as now being conducted, and is duly qualified as a foreign corporation
in all jurisdictions in which it is required to be so qualified. Each Subsidiary
is wholly owned by Synbiotics and/or by other Subsidiaries and no Person other
than Synbiotics and its Subsidiaries has any right to participate in, or receive
any payment based on any amount relating to, the revenue, income, value or net
worth of the Subsidiaries or any component or portion thereof, or any increase
or decrease in any of the foregoing or acquire any capital stock of any
Subsidiary.

Section 3.4    Absence of Certain Changes.
               --------------------------

Since the Financial Statement Date there has not been:

         3.4.1 any damage, destruction or loss of any of the properties or
assets of Synbiotics (whether or not covered by insurance) materially adversely
affecting the business or business prospects of Synbiotics or any agreement to
do any such acts;

         3.4.2 any dividend, declaration, setting aside or payment or other
distribution in respect of any of Synbiotics' capital stock or any direct or
indirect redemption, purchase or other acquisition of any of such stock by
Synbiotics;

         3.4.3 any labor dispute, or any other event, development, or condition,
of any character, or threat of the same, materially adversely affecting the
business or business prospects of Synbiotics;

         3.4.4 any material asset or property of Synbiotics made subject to a
lien of any kind;

         3.4.5 any material liability or obligation of any nature whatsoever
(contingent or otherwise) incurred by Synbiotics, other than current material
liabilities or obligations incurred in the ordinary course of business;

         3.4.6 any waiver of any valuable right of Synbiotics, or the
cancellation of any material debt or claim held by Synbiotics;

                                       -6-



          3.4.7     any issuance of any stock, bonds or other securities
     (including options, warrants or rights) of Synbiotics or any agreements or
     commitments respecting the same;

          3.4.8     any sale, assignment or transfer of any material tangible or
     intangible assets of Synbiotics except with respect to tangible assets in
     the ordinary course of business;

          3.4.9     any loan by Synbiotics to any officer, director, employee or
     stockholder of Synbiotics, or any agreement or commitment therefor; or

          3.4.10    any increase, direct or indirect, in the compensation paid
     or payable to any officer, director, employee or agent of Synbiotics;

          3.4.11    any cancellation or compromise of any debt or claim, except
     in the ordinary course of business and consistent with past practice;

          3.4.12    any waiver or release of any rights of material value;

          3.4.13    any transfer or grant of any material rights under any
     concessions, leases, licenses, agreements, patents, inventions, trademarks,
     trade names, service marks or copyrights or with respect to any know-how;

          3.4.14    any wage or salary increase applicable to any group or
     classification of employees generally (other than in connection with the
     general salary plan of Synbiotics), any employment contract with any
     officer or employee or made any loan to, or any material transaction of any
     other nature with any officer or employee of Synbiotics;

          3.4.15    any material transaction, contract or commitment, except
     contracts listed, or which pursuant to the terms hereof are not required to
     be listed, in the Disclosure Letter by virtue of this Section 3.4, and
     except this Agreement and the transactions contemplated hereby;

          3.4.16    any change in its accounting methods or practices.

     Section 3.5    Litigation.
                    ----------

     There are no suits, proceedings or investigations pending or threatened
against or affecting Synbiotics or an officer of Synbiotics which could have a
material adverse effect on the business, assets, or financial condition of
Synbiotics or the ability of any officer to participate in the affairs of
Synbiotics, or which concern the transactions contemplated by the Agreement. The
foregoing includes, without limiting its generality, actions pending or
threatened or any basis therefor known to Synbiotics, involving the prior
employment of any employees or currently contemplated prospective employees of
Synbiotics or their use, in connection with the business of Synbiotics, of any
information or techniques which might be alleged to be proprietary to their
former employers.

          3.5.1     Conflict of Interests. Neither Synbiotics nor any officer,
                    ---------------------
     employee, agent or any other person acting on behalf of Synbiotics has,
     directly or indirectly, given or agreed to give any money, gift or similar
     benefit (other than legal price concessions to customers in the

                                      -7-



     ordinary course of business) to any customer, supplier, employee or agent
     of a customer or supplier, or official or employee of any governmental
     agency or instrumentality of any government (domestic or foreign) or other
     Person who was, is, or may be in of a position to help or hinder the
     business of Synbiotics (or assist in connection with any actual or proposed
     transaction) which (1) might subject Synbiotics to any damage or penalty in
     any civil, criminal or governmental litigation or proceeding, (2) if not
     given in the past, might have had a material adverse effect on the assets,
     business or operations of Synbiotics as reflected in the Financial
     Statements, or (3) if not continued in the future, might materially
     adversely affect the assets, business, operations or prospects of
     Synbiotics.

          3.5.2     Other Relationships. The officers of Synbiotics have no
                    -------------------
     interest other than as noncontrolling holders of securities of a publicly
     traded company, either directly or indirectly, in any entity, including
     without limitation, any corporation, partnership, joint venture,
     proprietorship, firm, person, licensee, business or association (whether as
     an employee, officer, director, shareholder, agent, independent contractor,
     security holder, creditor, consultant, or otherwise) that presently (1)
     provides any services or designs, produces and/or sells any products or
     product lines, or engages in any activity which is the same, similar to or
     competitive with any activity or business in which Synbiotics is now
     engaged; (2) is a supplier of, customer of, creditor of, or has an existing
     contractual relationship with Synbiotics; or (3) has any direct or indirect
     interest in any asset or property used by Synbiotics or any property, real
     or personal, tangible or intangible, that is necessary or desirable for the
     conduct of the business of Synbiotics. No current or former stockholder,
     director, officer or employee of Synbiotics nor any Affiliate of any such
     person, is at present, or since 1994 has been, directly or indirectly
     through his affiliation with any other person or entity, a party to any
     transaction (other than as an employee or consultant) with Synbiotics
     providing for the furnishing of services by, or rental of real or personal
     property from, or otherwise requiring cash payments to any such person.

     Section 3.6    Licenses; Compliance with Laws, Other Agreements, etc.
                    -----------------------------------------------------

     Synbiotics has all franchises, permits, licenses, and other rights which it
currently deems necessary for the conduct of its business and it knows of no
basis for the denial of such rights in the future. Synbiotics is not in material
violation of any order or decree of any court, or of the provisions of any
contract or agreement to which it is a party or by which it may be bound, or, to
its Best Knowledge, of any law, order, or regulation of any governmental
authority, and neither this Agreement nor the transactions contemplated hereby
will result in any such violation.

          3.6.1     Intellectual Property Rights and Government Approvals.
                    -----------------------------------------------------
     Included in the Disclosure Letter is a true and complete list and summary
     description of all patents, trademarks, service marks, trade names,
     copyrights (which have been filed with the federal copyright authorities)
     and rights or licenses to use the same, and any and all applications
     therefor, presently owned or held by Synbiotics. Such patents, trademarks,
     service marks, trade names, copyrights and rights or licenses to use the
     same, and any and all applications therefor, as well as all trade secrets
     and similar proprietary information owned or held by Synbiotics, are all
     that are required to enable Synbiotics to conduct its business as now
     conducted, and Synbiotics believes that it either now owns, has the right
     to use, possesses or

                                      -8-



     will be able to obtain possession of or develop, and (with respect to its
     trade secrets and similar proprietary information) has provided adequate
     safeguards and security for the protection of, all such rights which it
     will require to conduct its business as proposed to be conducted as
     described in the SEC Reports. Synbiotics has not received any formal or
     informal notice of infringement or other complaint that Synbiotics'
     operations traverse or infringe rights under patents, trademarks, service
     marks, trade names, trade secrets, copyrights or licenses or any other
     proprietary rights of others, nor does Synbiotics have any reason to
     believe that there has been any such infringement. No person affiliated
     with Synbiotics has wrongfully employed any trade secrets or any
     confidential information or documentation proprietary to any former
     employer, and no person affiliated with Synbiotics has violated any
     confidential relationship which such person may have had with any third
     party. Synbiotics has and will have full right and authority to utilize the
     processes, systems and techniques presently employed by it in the design,
     development and manufacture of its present products and all of its other
     products contemplated by the SEC Reports and all rights to any processes,
     systems and techniques developed by any employee or consultant of
     Synbiotics has been and will be duly and validly assigned to Synbiotics. No
     royalties, honorariums or fees are or will be payable by Synbiotics to
     other persons by reason of the ownership or use by Synbiotics of said
     patents, trademarks, service marks, trade names, trade secrets, copyrights
     or rights or licenses to use the same or similar proprietary information,
     or any and all applications therefor. Synbiotics has all material
     governmental approvals, authorizations, consents, licenses and permits
     necessary or required to conduct its business as described in the SEC
     Reports. Synbiotics to its Best Knowledge represents and warrants that no
     employee of Synbiotics owns or holds, directly or indirectly, any interests
     in any patents, trademarks, service marks, trade names, trade secrets,
     copyrights, licenses, inventions, any and all applications therefor, or any
     other proprietary rights used or currently contemplated to be used by
     Synbiotics.

          3.6.2     Government Approvals. Except as may be required by any state
                    --------------------
     "blue sky" laws, no authorization, consent, approval, license,
     qualification or formal exemption from, nor any filing, declaration or
     registration with, any court, governmental agency, regulatory authority or
     political subdivision thereof, any securities exchange or any other Person
     is required in connection with the execution, delivery or performance by
     Synbiotics of this Agreement or the business of Synbiotics or any of its
     Subsidiaries in order to consummate the transactions contemplated in this
     Agreement. All such material authorizations, consents, approvals, licenses,
     qualifications, exemptions, filings, declarations and registrations have
     been obtained or made, as the case may be, and are in full force and effect
     and are not the subject of any pending or, to the Best Knowledge of
     Synbiotics, threatened attack by appeal or direct proceeding or otherwise.

          3.6.3     Products, Inventories and Operations.
                    ------------------------------------

                    3.6.3.1   Synbiotics manufactures and has at all times
          manufactured all of its products (the "Products") in compliance in all
          material respects with (i) all rules and regulations with respect to
          Good Manufacturing Practices as such may be determined by the Federal
          Food and Drug Administration ("FDA") ("GMP Requirements") and in
          compliance in all material respects with all representations made in
          any submissions

                                      -9-




          to the FDA concerning or relating to the Products, including
          submissions to obtain marketing approval, and (ii) all relevant rules
          and regulations as promulgated by the United States Department of
          Agriculture ("USDA"). Synbiotics has maintained its registration of
          its manufacturing facilities with FDA and USDA at all times.

                    3.6.3.2 The finished goods inventories, net of reserves for
          excess and obsolete inventories, of the Products at the closing are in
          good, usable and salable condition, free from any defect, whether
          latent or patent, and currently of a quality, strength and purity
          which is in conformity with applicable FDA and USDA regulations. No
          article in such inventories is adulterated or misbranded within the
          meaning of the Federal Food, Drug and Cosmetic Act nor is any finished
          article contained in such inventories an article which may not, under
          the provisions of Sections 404 or 505 of the said Act, be introduced
          into interstate commerce for the uses thereof previously made by
          Synbiotics or in violation with any rules and regulations of the USDA.
          The inventories of finished goods of the Products are packaged for
          resale in customary packaging used for those products by Synbiotics.


                    3.6.3.3 The manufacture, use and sale by Synbiotics of the
          Products are in accordance in all material respects with the
          provisions of the applicable authorizations, comply in all material
          respects with all applicable laws and regulations and do not interfere
          with the rights of any Person to know-how or to any property right the
          existence of which would materially adversely affect the value of the
          Products.

                    3.6.3.4 Since January 1, 1995, Synbiotics has not failed to
          file any report, data, or other information with respect to the
          Products, the materials or the operation of Synbiotics's plants where
          the Products are manufactured that is required to be filed with the
          FDA, USDA, or any other federal, state or local government agency or
          other governmental agency, which failure to file would materially
          adversely affect the Products, the materials or the operations of
          Synbiotics' plants where the Products are manufactured. Synbiotics is
          in all material respects in compliance with current federal, state,
          state agency and local government and other governmental reporting
          requirements, if any, relating to the Products, the materials and the
          plant operation where the Products are manufactured. To its Best
          Knowledge, Synbiotics is not under any investigation by the FDA and/or
          USDA, nor is Synbiotics subject to any outstanding FDA and/or USDA
          warning letter or any FDA and/or USDA order of any nature concerning
          any aspect of its business.

                    3.6.3.5 All material information concerning the Products,
          the materials and the operation of Synbiotics's plants where the
          Products are manufactured, including published and unpublished data,
          relating to the safety and efficacy of the Products, coming to the
          attention of Synbiotics within four years prior to the Closing Date
          not already listed in the Disclosure Letter will be promptly disclosed
          to Redwood prior to Closing. Synbiotics will transmit to Redwood any
          adverse reaction, adverse experience or quality complaints pertaining
          to the Products coming to Synbiotics

                                      -10-



          attention after the Closing Date addressed to Redwood at the address
          set forth hereafter.

                    3.6.3.6   The Disclosure Letter contains a true and correct
          list of the Products currently in inventory, currently being
          manufactured and products or technology related to the Products.

                    3.6.3.7   With respect to the Products currently being
          manufactured, Synbiotics has a sufficient combination of manufacturing
          and testing instructions, formulae and other documentation. Synbiotics
          shall preserve all such manufacturing instructions, formulae and other
          documentation and all available information concerning the Products
          under development and shall disclose to Redwood in confidence all
          manufacturing processes and trade secrets possessed by Synbiotics
          relating to the Products.

                    3.6.3.8   Ownership and Status of Stock.
                              -----------------------------

     The Disclosure Letter sets forth the number of shares of Common Stock of
Synbiotics that is outstanding and that is reserved upon the conversion of all
existing warrants, options, convertible notes and other convertible securities
and agreements of any nature to issue additional Common Stock of any nature. All
the outstanding Common Stock is, and upon issuance and payment therefor in
accordance with the terms of this Agreement, all of the outstanding shares of
the Preferred Stock will be, validly issued, fully paid and nonassessable. All
the outstanding Common Stock has been issued in full compliance with applicable
law. None of the shares of the Common Stock or the Preferred Stock are held in
Synbiotics' treasury. The Common Stock and the Preferred Stock are not entitled
to cumulative voting rights, preemptive rights, antidilution rights or so-called
registration rights under the `33 Act, except as otherwise provided in this
Agreement or in the powers, designations, rights and preferences of the
Preferred Stock contained in the Certificate of Determination. Synbiotics has
not issued any phantom stock or stock appreciation rights. The Common Stock and
the Preferred Stock have the preferences, voting powers, qualifications, and
special or relative rights or privileges set forth in the Articles of
Incorporation. Immediately after issuance of the Preferred Stock, the voting
rights of the Preferred Stock will, consistent with Section 2.1 hereof, be as
provided in the Certificate of Determination. There is, and immediately upon
consummation of the transactions contemplated hereby there will be, no
agreement, restriction or encumbrance with respect to the sale or voting of any
shares of capital stock of Synbiotics (whether outstanding or issuable upon
conversion or exercise of outstanding securities) except for the offering and
sale of Preferred Stock pursuant to this Agreement. Synbiotics has no obligation
to register any of its presently outstanding securities or any of its securities
which may thereafter be issued under the `33 Act.

                                      -11-



     Section 3.7    Brokers, etc.
                    ------------

     Synbiotics has not dealt with any broker, finder, or other similar person
in connection with the offer or sale of the Preferred Stock and the transactions
contemplated by this Agreement, and Synbiotics is not under any obligation to
pay any broker's fee, finder's fee or commission in connection with such
transactions.

     Section 3.8    Private Sale.
                    ------------

     Synbiotics has not, either directly or through any agent, since before 1998
offered any securities to or solicited any offers to acquire any securities
from, or otherwise approached, negotiated, or communicated in respect of any
securities with, any person in such a manner as to require that the offer or
sale of such securities, including but not limited to the Preferred Stock, be
registered pursuant to the `33 Act or the securities laws of any state, except
where such registration has been duly obtained, and neither Synbiotics nor
anyone acting on its behalf will take any action prior to the Closing that would
cause any such registration to be required (including, without limitation, any
offer, issuance or sale of any security of Synbiotics under circumstances which
might require the integration of such security with the Preferred Stock under
the `33 Act or the rules and regulations of the SEC thereunder) which might
subject the offering, issuance or sale of the Preferred Stock to the
registration provisions of the `33 Act. The issuance of Preferred Stock and the
issuance of shares of Common Stock issuable upon the conversion of the Preferred
Stock, are exempt from registration under the `33 Act. Synbiotics has complied
with all federal and state securities and blue sky laws in all issuances and
purchases of its capital stock prior to the date hereof and has not violated any
applicable law in making such issuances and purchases of its capital stock prior
to the date hereof. Any notices required to be filed under federal and state
securities and blue sky laws prior to or subsequent to the Closing shall be
filed on a timely basis prior to or as so required.

     Section 3.9    Reports.
                    -------

     Synbiotics has filed with the SEC all filings required to be made and such
filings set forth complete and accurate descriptions of all material plans,
agreements and arrangements by which Synbiotics may be bound and certain
financial and other information concerning Synbiotics. Such filings are true and
correct in all material respects, including the financial statements and other
financial information contained therein, do not contain any untrue statement of
material fact nor do they omit to state any material fact necessary to make the
statements in such reports in light of the circumstances in which they were made
not misleading. The SEC Reports read in connection with materials made available
to Redwood by Synbiotics do not contain any untrue statement of a material fact
nor do they omit to state any material fact necessary to make the statement
therein not misleading.

          3.9.1     Projections; Material Facts. Synbiotics knows of no
                    ---------------------------
     information or fact which has or would have a material adverse effect on
     the financial condition, business or business prospects of Synbiotics which
     has not been disclosed to Redwood. Since the respective dates as of which
     information is given in the SEC Reports, Synbiotics knows of no material
     adverse change in the business, business prospects, property, condition or
     results of

                                      -12-



     operations of Synbiotics. All projected information supplied to Redwood by
     Synbiotics has been prepared by Synbiotics in good faith based on its Best
     Knowledge, information and belief and assumptions which Synbiotics believes
     to be reasonable.

     Section 3.10 Investigation.
                  -------------

     It shall be no defense to an action for breach of this Agreement that
Redwood or its agents have made investigations into the affairs of Synbiotics or
that Synbiotics could not have known of the misrepresentation or breach of
warranty. Damages for breach of a representation or warranty or other provision
of this Agreement shall not be diminished by alleged tax savings resulting to
the complaining party as a result of the loss complained of.

     Section 3.11 Section 83(b) Elections.
                  -----------------------

     To Synbiotics' Best Knowledge, all elections and notices required by
Section 83(b) of the Code and any analogous provisions of applicable state tax
laws have been timely filed by all individuals who have purchased unvested
shares of Synbiotics' Common Stock and Synbiotics has been notified of the same
and will be so notified in the future.

     Section 3.12 Employment Contracts, etc.; Certain Material Transactions.
                  ---------------------------------------------------------

     Synbiotics is not a party to any employment or deferred compensation
agreements. Synbiotics does not have any bonus, incentive or profit-sharing
plans. Synbiotics does not have any pension, retirement or similar plans or
obligations, whether funded or unfunded, of a legally binding nature or in the
nature of informal understandings. There are no existing material arrangements
or proposed material transactions between Synbiotics and any officer or director
or holder of more than 10% of the capital stock of Synbiotics. Synbiotics is not
a party to any collective bargaining agreement and, to its Best Knowledge, no
organizational efforts are currently being made with respect to any of their
respective employees. To the Best Knowledge of Synbiotics, none of its employees
have any plans to terminate their respective relationships with Synbiotics
and/or any of its Subsidiaries. The Disclosure Letter sets forth the name (and,
where applicable, the title) of each person employed by Synbiotics as of
December 31, 2001, whose total compensation (inclusive of salary and bonuses)
for the fiscal year then ended exceeded $75,000 as well as the specific amount
paid during or accrued in respect of such fiscal year to or for the account of
each such person (i) as basic salary and (ii) as bonus and other compensation.

     Section 3.13 Contracts and Commitments, etc.
                  ------------------------------

     Synbiotics is not a party to any written or oral contract or commitment not
made in the ordinary course of business. Whether or not made in the ordinary
course of business, Synbiotics is not a party to any written or oral (1)
contract or commitment with any labor union, (2) contract or commitment for the
future purchase of fixed assets, materials, supplies, or equipment involving an
amount in excess of $25,000, (3) contract of commitment for the employment of
any officer, individual employee or other person on a full-time basis or any
contract with any individual on a consulting basis, (4) bonus, pension,
profit-sharing, retirement, stock purchase, stock option, or extraordinary
hospitalization, medical insurance or similar plan, contract or understanding in
effect

                                      -13-



with respect to employees or any of them or the employees of others, (5)
agreements, indentures or commitments relating to the borrowing of money or to
the mortgaging, pledging or otherwise placing of a lien on any assets of
Synbiotics, (6) guaranty of any obligation for borrowed money or otherwise, (7)
lease or agreement under which Synbiotics is lessor of or permits any third
party to hold or operate any property, real or personal, owned or controlled by
Synbiotics, (8) agreement or other commitment for capital expenditures in excess
of $25,000 in the aggregate, (9) contract or agreement under which Synbiotics is
obligated to pay any broker's fees, finder's fees or any such similar fees to
any third party, (10) contract, agreement or commitment entered into on or after
January 1, 1999 under which Synbiotics has issued, or may become obligated to
issue, any shares of capital stock of Synbiotics, or any warrants, options,
convertible securities or other commitments pursuant to which Synbiotics is or
may become obligated to issue any shares of its Common Stock, or (11) any other
contract, agreement, arrangement or understanding which is material to the
business of Synbiotics or which is material to a prudent investor's
understanding of the business of Synbiotics. Synbiotics has furnished to counsel
for Redwood true and correct copies of such agreements and other documents
requested by Redwood or their authorized representatives.

     Section 3.14 Employee Plans.
                  --------------

          3.14.1 The Disclosure Letter sets forth a complete list of each
     "employee benefit plan" (within the meaning of Section 3(3) of the Employee
     Retirement Income Security Act of 1974, as amended ("ERISA"), including,
     without limitation, all stock purchase, stock option, severance,
     employment, change-in-control, fringe benefit, collective bargaining,
     bonus, incentive, deferred compensation and all other employee benefit
     plans, agreements, programs, policies or other arrangements, whether or not
     subject to ERISA, whether formal or informal, oral or written, legally
     binding or not, under which any employee or former employee of Synbiotics
     has any present or future right to benefits sponsored or maintained by
     Synbiotics or under which Synbiotics has had or has any present or future
     liability. All such plans, agreements, programs, policies and arrangements
     shall be collectively referred to as the "Employee Plans."

          3.14.2 With respect to each Employee Plan, Synbiotics has provided to
     counsel to Redwood a current, accurate and complete copy (or, to the extent
     no such copy exists, an accurate description) thereof and, to the extent
     applicable: (1) any related trust agreement or other funding instrument;
     (2) the most recent determination letter, if applicable; (3) any summary
     plan description and other written communications (or a description of any
     oral communications) by Synbiotics to its employees concerning the extent
     of the benefits provided under an Employee Plan; and (4) for the three most
     recent years, (A) the Form 5500 and attached schedules, (B) audited
     financial statements, (C) actuarial valuation reports and (D) attorney's
     response to an auditor's request for information.

          3.14.3 (1) Each Employee Plan has been duly authorized by the Board of
     Directors of Synbiotics; (2) Each Employee Plan has been established and
     administered in accordance with its terms, and in substantial compliance
     with the applicable provisions of ERISA, the Code and all other applicable
     laws, rules and regulations; (3) each Employee Plan which is intended to be
     qualified within the meaning of Code Section 401(a) is so qualified, has
     received a favorable determination letter as to its qualification, and
     nothing has occurred,

                                      -14-



     whether by action or failure to act, that could reasonably be expected to
     cause the loss of such qualification; (4) no event has occurred and no
     condition exists that would subject Synbiotics, either directly or by
     reason of their affiliation with any member of its "Controlled Group"
     (defined as any organization which is a member of a controlled group of
     organizations within the meaning of Code Sections 414(b), (c), (m) or (o)),
     to any tax, fine, lien, penalty or other liability imposed by ERISA, the
     Code or other applicable laws, rules and regulations; (5) for each Employee
     Plan with respect to which a Form 5500 has been filed, no material change
     has occurred with respect to the matters covered by the most recent Form
     since the date thereof; (6) no "reportable event" (as such term is defined
     in ERISA Section 4043), "prohibited transaction" (as such term is defined
     in ERISA Section 406 and Code Section 4975) or "accumulated funding
     deficiency" (as such term is defined in ERISA Section 302 and Code Section
     412 (whether or not waived)) has occurred with respect to any Employee
     Plan; (7) no Employee Plan provides retiree welfare benefits, and
     Synbiotics has no obligation to provide any retiree welfare benefits; and
     (8) neither Synbiotics nor any member of its Controlled Group has engaged
     in, or is a successor or parent corporation to an entity that has engaged
     in, a transaction described in Section 4069 or 4212(c) of ERISA.

          3.14.4 None of the Employee Plans is subject to Title IV of ERISA
     (including without limitation, any multiemployer plan within the meaning of
     ERISA Section 4001(a)(3)) and neither Synbiotics or any member of their
     Controlled Group has incurred any liability under Title IV of ERISA which
     remains unsatisfied.

          3.14.5 None of the Employee Plans is an employee stock ownership plan
     as defined in Section 4975(e)(7) of the Code.

          3.14.6 Neither Synbiotics nor any member of its Controlled Group
     maintains or contributes to, or has ever maintained or contributed to, or
     been required to contribute to a multiemployer plan within the meaning of
     Section 3(37) of ERISA.

          3.14.7 With respect to any Employee Plan: (1) no actions, suits,
     claims (other than routine claims for benefits in the ordinary course) are
     pending or, to the Best Knowledge of Synbiotics, threatened; (2) no facts
     or circumstances exist that could give rise to any such actions, suits or
     claims; (3) no administrative investigation, audit or other administrative
     proceeding by the Department of Labor, the Pension Benefit Guaranty
     Corporation, the Internal Revenue Service or other governmental agencies
     are pending, in progress or, to the Best Knowledge of Synbiotics,
     threatened; (4) there are no negotiations, demands or proposals which are
     pending or have been made which concern matters now covered, or that would
     be covered, by such Employee Plans; and (5) no contributions are required
     to be made by Synbiotics, and all other liabilities shall have been
     satisfied prior to or on the Closing Date.

          3.14.8 No Employee Plan exists that could result in the payment to any
     present or former employee of Synbiotics of any money or other property or
     accelerate or provide any other rights or benefits to any present or former
     employee of Synbiotics as a result of the transactions contemplated by this
     Agreement. There is no contract, plan or arrangement (written or otherwise)
     covering any employee or former employee of Synbiotics that,

                                      -15




     individually or collectively, could give rise to the payment of any amount
     that would not be deductible pursuant to the terms of Section 280G of the
     Code.

          3.14.9  All group health plans of Synbiotics or any member of its
     Controlled Group have been operated in compliance with the group health
     plan continuation coverage requirements of Section 4980B of the Code to the
     extent such requirements are applicable.


          3.14.10 There have been no acts or omissions by Synbiotics which have
     given rise to or may give rise to fines, penalties, taxes, or related
     charges under Section 502(c) or (k) or 4071 of ERISA or Chapter 43 of the
     Code.

     Section 3.15 Banks, Agents, etc.
                  ------------------

          The Disclosure Letter contains a complete and correct list setting
forth the name of (1) each bank in which Synbiotics has an account, safe deposit
box or borrowing privilege and the names of all persons authorized to draw
thereon, to have access thereto or to borrow thereupon, as the case may be, and
(2) each agent to whom such corporation has granted a written power of attorney
or similar authority to act on its behalf.

     Section 3.16 Minute Books.
                  ------------

         The minute books of Synbiotics contain a complete summary of all
meetings of directors and stockholders since the time of incorporation and
reflect all transactions referred to in such minutes accurately in all material
respects.

     Section 3.17 Environmental Liabilities.
                  -------------------------

     Synbiotics, together with any real property that it owns, leases, or
otherwise occupies or uses and the operations of its business (the "Premises")
are in compliance in all material respects with all applicable Environmental
Laws (as defined below) and orders or directives or any governmental authorities
having jurisdiction under such Environmental Laws, including, without
limitation, any Environmental Laws or orders or directives with respect to any
cleanup or remediation of any release or threat of release of Hazardous
Substances. Synbiotics has not since 1998 received any citation, directive,
letter or other communication, written or oral, or any notice of any
proceedings, claims or lawsuits, from any person, entity or governmental
authority arising out of the ownership or occupation of the Premises or the
conduct of its operations, nor is it aware of any basis therefor. Synbiotics has
obtained and is maintaining in full force and effect all necessary permits,
licenses and approvals required by any Environmental Laws applicable to the
Premises and the business operations conducted thereon (including operations
conducted by tenants on the Premises), and is in compliance with all such
permits, licenses and approvals. Synbiotics has not caused or allowed a release,
or a threat of release, of any Hazardous Substance unto, at or near the Premises
nor, to its Best Knowledge, has the Premises or any property at or near the
Premises ever been subject to a release, or a threat of release, of any
Hazardous Substance, except as would not have a material adverse effect on
Synbiotics or its business. For purposes of this Agreement, the term
"Environmental Laws" shall mean any federal, state or local law, ordinance or
regulation pertaining to the protection of human health or the environment,
including without limitation, the

                                      -16-



Comprehensive Environmental Response, Compensation and Liability Act, 42 U.S.C.
9601 et seq., Emergency Planning and Community Right-to-Know Act, 42 U.S.C.
     -- ---
11001 et seq., and the Resource Conservation and Recovery Act, 42 U.S.C. 6901 et
      -- ---                                                                  --
seq. For purposes of this Agreement, the term "Hazardous Substances" shall
- ---
include oil and petroleum products, asbestos, polychlorinated biphenyls and urea
formaldehyde, and any other materials classified as hazardous or toxic under any
Environmental Laws.

     Section 3.18 Maintenance of Corporate Existence.
                  ----------------------------------

     Since the Financial Statement Date, each of Synbiotics and its Subsidiaries
have and will preserve, renew and keep in full force and effect, its corporate
existence, qualification in requisite jurisdictions and rights and privileges
necessary or desirable in the normal conduct of its business and have and will
carry on its business in the ordinary course consistent with past practices.

                       Article 4. Covenants of Synbiotics

     Section 4.1  Proprietary Information.
                  -----------------------

     Synbiotics shall use its reasonable best efforts to (1) ensure that no
person employed by Synbiotics will wrongfully employ any confidential
information or documentation proprietary to any former employer, (2) protect, by
maintenance of secrecy to the extent appropriate, all technical and business
information developed by and belonging to Synbiotics which has not been
patented, (3) cause to be patented all technological information developed by
and belonging to Synbiotics, which, in the opinion of Synbiotics and its
counsel, is patentable and is best protected by patenting, and (4) cause each
person who becomes an employee of Synbiotics and who shall have access to
confidential or proprietary information of Synbiotics, to execute an agreement
relating to matters of noncompetition and nondisclosure and assignment.

     Section 4.2  Licenses and Trademarks.
                  -----------------------

     Synbiotics shall use its reasonable best efforts to own, possess and
maintain all patents, trademarks, service marks, trade names, copyrights and
licenses necessary or useful in the conduct of its business.

     Section 4.3  Liability Insurance.
                  -------------------

     Synbiotics will maintain in full force and effect a policy or policies of
standard comprehensive general liability insurance underwritten by a U.S.
insurance company insuring its properties and business against such losses and
risks, and in such amounts as are adequate for its business and as are
customarily carried by entities of similar size engaged in the same or similar
business. Such policies shall include property loss insurance policies, with
extended coverage, sufficient in amount to allow the replacement of any of its
tangible properties which might be damaged or destroyed by the risks or perils
normally covered by such policies.

                                      -17-



     Section 4.4 Taxes and Assessments.
                 ---------------------

     Synbiotics will pay and will cause each of its Subsidiaries to pay any
taxes, assessments and governmental charges, and any liabilities thereon,
outstanding and past due as of the Closing Date. Synbiotics will pay and
discharge and will cause each of its Subsidiaries to pay and discharge, before
the same become delinquent and before penalties accrue thereon, all taxes,
assessments and governmental charges upon or against Synbiotics or any of its
Subsidiaries, or any of their respective properties, and all other material
liabilities at any time existing, except to the extent and so long as (1) the
same are being contested in good faith and by appropriate proceedings in such
manner as not to cause any material adverse effect upon the financial condition
of Synbiotics or any of its Subsidiaries, or the loss of any right of redemption
from any sale thereunder and (2) Synbiotics or any of its Subsidiaries shall
have set aside on its books adequate reserves with respect thereto.

     Section 4.5 Governmental Consents.
                 ---------------------

     Synbiotics will obtain all consents, approvals, licenses and permits
required by federal, state, local and foreign law to carry on its business.

     Section 4.6 Further Assurances.
                 ------------------

     Synbiotics will cure promptly any defects in the creation and issuance of
the Shares, and in the execution and delivery of this Agreement. Synbiotics, at
its expense, will promptly execute and deliver promptly to Redwood upon request
all such other and further documents, agreements and instruments in compliance
with or pursuant to its covenants and agreements herein, and will make any
recordings, file any notices, and obtain any consents as may be necessary or
appropriate in connection therewith.

     Section 4.7 Expenses.
                 --------

     Synbiotics will, upon proper documentation thereof, reimburse Redwood for
up to $60,000.00 of Redwood's out-of-pocket expenses incurred by it in
connection with transactions contemplated by this Agreement whether or not such
transactions are consummated.

     Section 4.8 Negative Covenants in Effect as Long as Preferred Stock is
                 ----------------------------------------------------------
Outstanding.
- -----------

     Synbiotics hereby agrees that as long as any shares of Preferred Stock are
outstanding it will not without the consent of a majority in interest of the
Preferred Stock:

          4.8.1 authorize or issue shares of any class of stock having any
     preference or priority as to dividends or assets superior to or on a parity
     with any such preference or priority of the Preferred Stock; increase or
     decrease the number of directors constituting the Board of Directors of
     Synbiotics; or reduce the percentage of shares of Preferred Stock required
     to consent to any of the above matters, or alter or negate the need for
     such consent;

                                      -18



          4.8.2     reclassify any shares of any class of stock into shares
     having any preference or priority as to dividends or assets superior to or
     on a parity with any such preference or priority of the Preferred Stock;

          4.8.3     make any amendment to its Articles of Incorporation or
     Bylaws adversely affecting (directly or indirectly) the rights of holders
     of the Preferred Stock; declare, agree to declare, pay or agree to pay
     dividends or make any other distribution on, or redeem, any shares of any
     class or series of its equity securities other than the Preferred Stock,
     unless all dividends accrued on shares of the Preferred Stock shall have
     been declared and paid, and Synbiotics' consolidated net worth (determined
     in accordance

           4.8.4    with generally accepted accounting principles consistently
     applied) will be in excess of $100,000.00 immediately after such payment,
     distribution or redemption; or

          4.8.5     enter into any new agreement or make any amendment to any
     existing agreement, which by its terms would restrict Synbiotics'
     performance of its obligations to holders of Preferred Stock pursuant to
     this Agreement or any agreement contemplated hereby.

     Section 4.9    Negative Covenants in Effect until Closing.
                    ------------------------------------------

     Synbiotics hereby represents and agrees that from the Financial Statement
Date until Closing, it will not:

          4.9.1     engage in any business other than businesses engaged in or
     proposed to be engaged in by Synbiotics on the date hereof or businesses
     similar thereto;

          4.9.2     merge or consolidate with any person or entity (other than
     mergers of wholly owned subsidiaries into Synbiotics), or sell, lease or
     otherwise dispose of its assets other than in the ordinary course of
     business involving an aggregate consideration of more than ten percent of
     the book value of its assets on a consolidated basis in any 12-month
     period, or liquidate, dissolve, recapitalize or reorganize;

          4.9.3     repurchase or agree to repurchase any shares of its Common
     Stock from any of its existing stockholders; or

          4.9.4     enter into any employment or severance agreement (other than
     the January 2002 amendments of Retention Plan Agreements described in
     Section 6.12).

     Section 4.10   Additional Common Stock.
                    -----------------------

     Synbiotics agrees to place before its shareholders at its next Shareholders
Meeting which shall be held on or before June 15, 2001 a proposal to amend its
Articles of Incorporation so as to increase the authorized Common Stock to that
number of shares which will be necessary to be issued to Redwood upon conversion
of the Preferred Stock plus at least an additional two million shares.

                                      -19-



     Section 4.11   Other Transactions.
                    ------------------

     Neither Synbiotics nor any of its agents shall solicit an offer from any
party other than Redwood with respect to any sale, merger of Synbiotics or any
similar transaction or the sale of any capital stock or material assets of
Synbiotics ("alternative offer"). Synbiotics' Board of Directors may, in the
exercise of their fiduciary obligation to their shareholders, accept an
alternative offer which is superior to that set forth by Redwood. Before
accepting any alternate offer, Synbiotics will notify Redwood promptly of any
alternative offer received identifying the offeror, providing a written copy of
the offer and allowing Redwood five business days to respond with a
counter-offer. Should this process result in the substantial amount of assets or
stock of Synbiotics being sold to another party or the acceptance of any other
alternative offer, and Redwood having been willing to close the transactions
contemplated by this Agreement in accordance with its terms, Synbiotics will pay
Redwood $150,000 (in addition to the expenses contemplated by Section 4.7
hereof) to compensate it for its time and costs involved in the transactions
contemplated by this Agreement.

     Section 4.12   Consulting Fees.
                    ---------------

     Synbiotics will pay Redwood Holdings, Inc. a consulting fee of $15,000 per
month so long as Redwood Holdings, Inc. controls at least 50% of the voting
power of Synbiotics through its control of Redwood.

     Section 4.13   Amendment to Rights Agreement.
                    -----------------------------

     Prior to Closing, Synbiotics will enter into an amendment to its Rights
Agreement dated October 1, 1998 with Mellon Investor Services LLC ("Rights
Agreement") for the purpose of excluding Redwood and its principals from the
definition of "Acquiring Person" so that the provisions of the Rights Agreement
will not be triggered by the transactions contemplated by this Agreement.

     Section 4.14   Waiver.
                    ------

     Any violation of an affirmative or negative covenant of Synbiotics may be
waived prospectively or retrospectively in a given instance by a vote of the
Redwood Board Members, but such waiver shall operate only with respect to the
particular violation specified in the waiver. The Redwood Board Members, and
Redwood on whose behalf they act, disclaim any intent or purpose to control
Synbiotics or to manage its affairs for the benefit of Redwood or otherwise.

     Section 4.15   Additional Shares.
                    -----------------

     If, as and when Synbiotics issues more than 8,254,300 shares of Common
Stock pursuant to amendments of pre-2001 Employee Retention Agreements,
Synbiotics shall issue to Redwood, without the payment of any further
consideration, a number of shares of Series B Preferred Stock convertible into
119.78% of the number of such extra shares of Employee Retention Agreements
Common Stock.

                                      -20-



              Article 5. Representations And Warranties Of Redwood

     Redwood represents and warrants to Synbiotics, at and as of the Closing
that:

     Section 5.1    Power and Authority.
                    -------------------

     Redwood has full power and authority and, has taken all required limited
liability company, corporate and other action necessary to permit it to execute
and deliver this Agreement, and all other documents or instruments required by
this Agreement, and to carry out the terms of this Agreement and of all such
other documents or instruments.

     Section 5.2    Purchase for Investment.
                    -----------------------

     Redwood is purchasing the Preferred Stock and any Common Stock into which
such Preferred Stock may be converted for investment, for its own account and
not with a view to distribution thereof, except for transfers permitted
hereunder and under the `33 Act. Redwood understands that the Preferred Stock
and any Common Stock received upon conversion of the Preferred Stock must be
held indefinitely unless it is registered under the `33 Act or an exemption from
such registration becomes available, and that the Preferred Stock and any Common
Stock received upon conversion thereof may only be transferred as provided in
this Agreement.

     Section 5.3    Financial Matters.
                    -----------------

     Redwood represents and warrants to Synbiotics that it understands that the
purchase of the Shares involves substantial risk and that its financial
condition and investments are such that it is in a financial position to hold
the Shares for an indefinite period of time and to bear the economic risk of,
and withstand a complete loss of its investment in, such Shares. In addition, by
virtue of its expertise, the advice available to it and previous investment
experience, Redwood has extensive knowledge and experience in financial and
business matters, investments, securities and private placements and the
capability to evaluate the merits and risks of the transactions contemplated by
this Agreement. Redwood represents that it is an "accredited investor" as that
term is defined in Regulation D promulgated under the `33 Act.

     Section 5.4    Brokers, etc.
                    ------------

     Redwood has dealt with no broker, finder, commission agent, or other
similar person in connection with the offer or sale of the Preferred Stock and
the transactions contemplated by this Agreement, and is under no obligation to
pay any broker's fee, finder's fee, or commission in connection with such
transactions.

                  Article 6. The Closing and Closing Conditions

     Section 6.1    The Closing.
                    -----------

     The purchase and sale of the Preferred Stock shall take place at the
Closing to be held at the offices of Keating, Muething & Klekamp, P.L.L. in
Cincinnati, Ohio. The Closing shall occur on or

                                      -21-



before January 25, 2002. The obligation of Redwood to purchase the Preferred
Stock at the Closing shall be subject to satisfaction of the conditions set
forth in Article 4 at and as of the Closing:

     Section 6.2    Issuance of Preferred Stock.
                    ---------------------------

     Synbiotics shall have duly issued and delivered certificates to Redwood for
the 2,800 shares of the Preferred Stock.

     Section 6.3    Legal Opinion from Counsel for Synbiotics.
                    -----------------------------------------

     Redwood shall have received from Brobeck, Phleger & Harrison LLP, counsel
for Synbiotics, a legal opinion in the form attached as Exhibit 6.3 hereto.

     Section 6.4    Representations and Warranties of Synbiotics True and
                    -----------------------------------------------------
Correct.
- -------

     The obligation of Redwood to consummate the transactions contemplated by
this Agreement is subject to the condition that the representations and
warranties of Synbiotics are true in all material respects at and as of the
Closing as if made at and as of the Closing, and that each of the conditions in
the control of Synbiotics in this Article 6 has been satisfied in all material
respects. At Closing Synbiotics shall have delivered to Redwood a certificate of
its chief executive and chief financial officers, or alternatives therefor
satisfactory to counsel for Redwood, dated the date of the Closing, to this
effect.

     Section 6.5    Employee Documents.
                    ------------------

     Prior to the Closing, each employee of and consultant to Synbiotics shall
have executed a Proprietary Information and Inventions Agreement.

     Section 6.6    Redwood Review.
                    --------------

     Prior to the Closing, Redwood shall have completed its review of, and shall
be satisfied with its conclusions regarding, Synbiotics' markets, business,
projected operations and prospects and nothing shall have come to the attention
of Redwood which, in its judgment, would materially or adversely affect the
value of the proposed transaction to it. In this connection, Redwood shall be
satisfied that that the following conditions have been met:

          6.6.1     There shall be no litigation pending seeking to enjoin, or
     questioning the validity of or restricting the transactions contemplated by
     this Agreement.

          6.6.2     Synbiotics shall not have experienced a material decrease in
     its revenues, and shall not have lost significant business from its
     customers.

          6.6.3     There shall not have occurred any material adverse change in
     the business, operations, financial condition, capital structure, or
     prospects of Synbiotics.

                                      -22-



     Section 6.7    Certificate of Determination.
                    ----------------------------

     The Certificate of Determination concerning the Preferred Stock shall have
been filed with the Secretary of State of California in accordance with
California law.

     Section 6.8    Opinion.
                    -------

     The Directors of Synbiotics have received an opinion of a financial
advisory firm to the effect that the consideration to be received by Synbiotics
in the transaction contemplated by this Agreement is fair, from a financial
point of view, to both Synbiotics and its shareholders.

     Section 6.9    Performance.
                    -----------

     Synbiotics shall have performed and complied in all material respects with
all agreements and conditions contained herein required to be performed or
complied with by it prior to or at the Closing Date.

     Section 6.10   All Proceedings to Be Satisfactory.
                    ----------------------------------

     All corporate and other proceedings to be taken by Synbiotics in connection
with the transactions contemplated hereby and all documents incident thereto
shall be satisfactory in form and substance to Redwood and its counsel, and
Redwood and said counsel shall have received all such counterpart originals or
certified or other copies of such documents as they may reasonably request.

     Section 6.11   Supporting Documents.
                    --------------------

     On or prior to the Closing Date Redwood and its counsel shall have received
copies of the following supporting documents:

          6.11.1    copies of the Articles of Incorporation of Synbiotics, and
     all amendments thereto, certified as of a recent date by the Secretary of
     State of the State of California.

          6.11.2    a certificate of said Secretary dated as of a recent date as
     to the due incorporation and good standing of Synbiotics and listing all
     documents of Synbiotics on file with said Secretary

          6.11.3    a certificate of the Secretary or an Assistant Secretary of
     Synbiotics, dated the Closing Date and certifying: (1) that attached
     thereto is a true and complete copy of the Bylaws of Synbiotics as in
     effect on the date of such certification; (2) that attached thereto is a
     true and complete copy of resolutions adopted by the Board of Directors of
     Synbiotics authorizing the execution, delivery and performance of this
     Agreement, the issuance, sale, and delivery of the Preferred Stock, and
     that all such resolutions are still in full force and effect and are all
     the resolutions adopted in connection with the transactions contemplated by
     this Agreement; (3) that except by the filing of the Certificate of
     Determination, the Articles of Incorporation of Synbiotics have not been
     amended since the date of the last amendment referred to in the certificate
     delivered pursuant to clause 6.11.2 above; and (4) the

                                      -23-




         incumbency and specimen signature of each officer of Synbiotics
         executing this Agreement, the stock certificate or certificates
         representing the Preferred Stock and any certificate or instrument
         furnished pursuant hereto, and a certification by another officer of
         Synbiotics as to the incumbency and signature of the officer signing
         the certificate referred to in this Section 6.11.3; and

                6.11.4 such additional supporting documents and other
         information with respect to the operations and affairs of Synbiotics as
         Redwood or its counsel may reasonably request.

                All such documents shall be satisfactory in form and substance
to Redwood and its counsel.

         Section 6.12  Reasonable Satisfaction of Redwood and Counsel.
                       ----------------------------------------------

         All instruments applicable to the issuance and sale of the Preferred
Stock and all proceedings taken in connection with the transactions contemplated
by this Agreement shall be reasonably satisfactory to Redwood (including,
without limitation, the execution and delivery by all Synbiotics employees of
Employee Retention Agreement amendments satisfactory to and as requested by
Redwood).

         Section 6.13  Financing.
                       ---------

         Prior to Closing, Comerica Bank shall have entered into the Third
Amendment to Credit Agreement and Loan Documents and Waiver of Defaults attached
as Exhibit 6.13 hereto.

         Section 6.14  Reconstitution of Board of Directors.
                       ------------------------------------

         Prior to the Closing, Patrick Owen Burns, James DeCesare, Donald
Phillips, and Joseph Klein shall resign from the Board of Directors of
Synbiotics effective upon the Closing and effective upon the Closing such Board
shall be reconstituted to consist of Thomas Donelan, Christopher Hendy, Paul
Rosinack, and Rigdon Currie. Immediately after Synbiotics complies with the
requirements of Rule 14f-1 of the `34 Act, Rigdon Currie shall resign so that
such Board will consist of three members including two Redwood Board Members and
Paul Rosinack. These three members may after the Closing increase the size of
the Board and appoint additional directors.

                            Article 7. Miscellaneous

         Section 7.1   Severability.
                       ------------

         Whenever possible, each provision of this Agreement shall be
interpreted in such a manner as to be effective and valid under applicable law,
but if any provision of this Agreement shall be prohibited by or invalid under
applicable law, such provisions shall be ineffective to the extent of such
prohibition or invalidity, without invalidating the remainder of such provision
or the remaining provisions of this Agreement.

                                      -24-



         Section 7.2   Parties in Interest.
                       -------------------

         All covenants and agreements contained in this Agreement by or on
behalf of any of the parties hereto shall bind and inure to the benefit of the
respective legal representatives, successors and assigns of the parties hereto
whether so expressed or not.

         Section 7.3   Notices.
                       -------

         Notices required under this Agreement shall be deemed to have been
adequately given if delivered in person or sent by electronic transmission with
evidence of sending and receipt at the addresses set forth below or such other
address as such party may from time to time designate in writing.



Redwood:

9468 Montgomery Road
Cincinnati, Ohio 45242
Attention: Jerry L. Ruyan
Tel: 513-984-9730
Fax: 513-984-8121
Email: ruyanj@redwoodventure.com

with a required copy to:

Gary P. Kreider, Esq.
Keating, Muething & Klekamp, P.L.L.
1400 Provident Tower
One East Fourth Street
Cincinnati, Ohio 45202
Tel: 513-579-6411
Fax: 513-579-6956
Email: gkreider@kmklaw.com

Synbiotics:

11011 Via Frontera
San Diego, CA 92127
Attention: Chief Executive Officer
Tel: 858-451-3771
Fax: 858-451-5719
Email: paul@synbiotics.com

                                      -25-




with a required copy to:

Hayden Trubitt, Esq.
Brobeck, Phleger & Harrison, LLP
12390 El Camino Real
San Diego, California 92130-2081
Tel: 858-720-2500
Fax: 858-720-2555
Email: htrubitt@brobeck.com

         Section 7.4   No Waiver.
                       ---------

         No failure to exercise and no delay in exercising any right, power or
privilege granted under this Agreement shall operate as a waiver of such right,
power or privilege. No single or partial exercise of any right, power or
privilege granted under this Agreement shall preclude any other or further
exercise thereof or the exercise of any other right, power or privilege. The
rights and remedies provided in this Agreement are cumulative and are not
exclusive of any rights or remedies provided by law.

         Section 7.5   Survival of Agreements, etc.
                       ---------------------------

         All agreements, representations and warranties contained in this
Agreement or made in writing by or on behalf of Synbiotics in connection with
the transactions contemplated by this Agreement shall survive the execution and
delivery of this Agreement, the Closing, and any investigation at any time made
by or on behalf of Redwood. Notwithstanding the preceding sentence, however, all
such representations (other than intentional misrepresentations) and warranties,
but no such agreements, shall expire two years after the date of this Agreement.

         Section 7.6   Construction.
                       ------------

         This Agreement shall be governed by and construed in accordance with
the procedural and substantive laws of Ohio without regard for its
conflicts-of-laws rules. Synbiotics agrees that it may be served with process in
Ohio and any action for breach of this Agreement prosecuted against it in the
courts of that State.

         Section 7.7   Entire Understanding.
                       --------------------

         This Agreement expresses the entire understanding of the parties and
supersedes all prior and contemporaneous agreements and undertakings of the
parties with respect to the subject matter of this Agreement.

         Section 7.8   Counterparts.
                       ------------

         This Agreement may be executed in one or more counterparts, each of
which shall be deemed to be an original but all of which taken together shall
constitute one agreement.

                                      -26-



         Section 7.9    Assignment; No Third-Party Beneficiaries.
                        ----------------------------------------

         This Agreement and the rights hereunder shall not be assignable without
the prior written consent of the parties hereto. Subject to the preceding
sentence, this Agreement shall be binding upon, inure to the benefit of and be
enforceable by the parties hereto and their respective successors and assigns.

         Exhibits are incorporated by reference into this Agreement as though
such exhibits were set forth at the point of such reference.

                             Article 8. Termination

         Section 8.1    Termination.
                        -----------

         This Agreement may be terminated at any time prior to the Closing:

                 8.1.1  by mutual consent;

                 8.1.2  by either Synbiotics or Redwood if the other party
         materially breaches any provision of this Agreement;

                 8.1.3  by either Synbiotics or Redwood if the Closing shall not
         have occurred by January 11, 2002, provided that the failure to
         consummate the transactions contemplated hereby is not a result of the
         failure by the party so electing to terminate this Agreement to perform
         any of its obligations hereunder. Time shall be of the essence in this
         respect.

         Section 8.2    Termination Pursuant to Section 4.11
                        ------------------------------------

         This Agreement may be terminated at any time prior to the Closing in
accordance with Section 4.11.

         Section 8.3    Effect of Termination.
                        ---------------------

         If this Agreement shall be terminated pursuant to Section 8.1, all
obligations, representations and warranties of the parties hereto under the
Agreement shall terminate, except as called for by Section 4.7, Section 4.11 and
Section 7.6 hereof, and there shall be no other liability, except for any breach
of this Agreement prior to such termination, of any party to another party.

                                      -27-



         IN WITNESS WHEREOF, the parties hereto have executed this Agreement
under seal as of the date first above written.

                                REDWOOD WEST COAST, LLC


                                By: /s/ Christopher P.Hendy
                                    -------------------------------------------
                                    Christopher P. Hendy, Managing Member




                                SYNBIOTICS CORPORATION


                                By: /s/ Paul A. Rosinack
                                    -------------------------------------------
                                    Paul A. Rosinack, President

                                      -28-



                                                             Exhibit 6.3
                                                             -----------

January 25, 2002                         Brobeck, Phleger & Harrison LLP
                                                    12390 El Camino Real
                                       San Diego, California  92130-2081
                                                    PHONE   858.720.2500
                                                      FAX   858.720.2555





Redwood West Coast, LLC
9468 Montgomery Road
Cincinnati, Ohio 45242

Ladies and Gentlemen:

          We have acted as counsel for Synbiotics Corporation, a California
corporation ("Synbiotics" or the "Company"), in connection with the issuance and
sale of shares of its Series B Preferred Stock ("Preferred Stock") pursuant to
the Stock Purchase Agreement dated January 23, 2002 (the "Agreement") between
the Company and you. This opinion letter is being rendered to you pursuant to
Section 6.3 of the Agreement in connection with the Closing of the sale of the
Preferred Stock. Capitalized terms not otherwise defined in this opinion letter
have the meanings given them in the Agreement.

          In rendering this opinion, our inquiry has been limited to a review of
the following documents:

     1. Synbiotics' Restated Articles of Incorporation, as amended (the
        "Articles of Incorporation"), Amended and Restated Bylaws (the
        "Bylaws"), corporate records and proceedings;

     2. The Agreement;

     3. A Certificate of Determination filed with the California Secretary of
        State for the purpose of creating the Preferred Stock as called for by
        the Agreement, and an Amendment thereto filed with the California
        Secretary of State;

     4. Amendments to certain retention plan agreements held by employees of
        Synbiotics and its subsidiaries;

     5. Synbiotics' Amended and Restated 1995 Stock Option/Stock Issuance Plan
        (the "1995 Plan");

     6. A Registration Statement on Form S-8 for the purpose of registering
        shares to be issued under the 1995 Plan;

     7. A Rights Agreement dated as of October 1, 1998 between Synbiotics and
        Mellon Investor Services LLC, a New Jersey limited liability company
        (formerly known as



Redwood West Coast, LLC
January 25, 2002


          ChaseMellon Shareholder Services, LLC) and a proposed amendment to
          that Rights Agreement; and

       8. Resolutions of the Board of Directors of Synbiotics.

               We have also made such examination of matters of California and
Federal law and of fact as in our judgment was necessary or appropriate for the
purposes of this opinion. As to matters of fact material to the opinions
expressed herein, we have relied upon the representations and warranties as to
factual matters contained in and made by Synbiotics pursuant to the Agreement
and upon certificates and statements of government officials and of officers of
the Company.

               In connection with this opinion, we have assumed the genuineness
of all signatures, the legal capacity of natural persons, the authenticity of
the documents submitted to us as originals, the conformity to the original
documents of all documents submitted to us as certified, facsimile, conformed or
photostatic copies and the authenticity of the originals of such copies.

               In rendering this opinion letter we have also assumed: (A) with
respect to the Agreement and all other documents pertinent to the transactions
contemplated by the Agreement, requisite limited liability company power, due
authorization, execution and delivery by, and the validity and binding effect
thereof on the part of Redwood; (B) that the representations and warranties made
in the Agreement by you are true and correct; and (C) that any wire transfers,
drafts or checks tendered by you will be honored.

               As used in this opinion letter, the expression "we are not aware"
or the phrase "to our knowledge," or any similar expression or phrase with
respect to our knowledge of matters of fact, means as to matters of fact that,
based on the actual knowledge of individual attorneys within the firm
principally responsible for handling current matters for the Company (and not
including any constructive or imputed notice of any information), and after an
examination of documents referred to herein and after inquiries of certain
officers of the Company, no facts have been disclosed to us that have caused us
to conclude that the opinions expressed are factually incorrect; but beyond that
we have made no factual investigation for the purposes of rendering this opinion
letter. Specifically, but without limitation, we have not searched the dockets
of any courts and we have made no inquiries of securities holders or employees
of the Company, other than such officers. No inference as to our knowledge of
the existence or absence of any fact should be drawn from our representation of
the Company or the rendering of the opinions set forth below.

               This opinion letter relates solely to the laws of the State of
California and the federal law of the United States, and we express no opinion
with respect to the effect or application of any other laws. Special rulings of
authorities administering such laws or opinions of other counsel have not been
sought or obtained.

               Based upon our examination of and reliance upon the foregoing and
subject to the limitations, exceptions, qualifications and assumptions set forth
below and except as set forth in

                                       2



Redwood West Coast, LLC
January 25, 2002

the Agreement or the Disclosure Letter furnished by the Company in connection
therewith, we are of the opinion that as of the date hereof:

     1.  Synbiotics is a duly organized, legally incorporated and validly
         existing corporation in good standing under the laws of California;

     2.  The execution and delivery of the Agreement, the offering and issuance
         at the Closing of the Preferred Stock contemplated by the Agreement and
         the issuance of Common Stock upon conversion of that Preferred Stock in
         the fulfillment of and compliance with the respective terms and
         provisions of the Agreement and the Certificate of Determination (as
         amended) filed with the California Secretary of State creating the
         Preferred Stock have been duly and validly authorized by all necessary
         corporate action;

     3.  Compliance with the terms and provisions of the Agreement and the
         Preferred Stock do not and will not conflict with or result in a breach
         of any of the terms, conditions, provisions of or constitute a material
         default under any material agreement, instrument, order, judgment or
         decree to which Synbiotics is subject so far as is known to us after
         having made due inquiry with respect thereto or result in any violation
         of, or require any authorization, consent, approval, exemption or other
         action by or notice to any court or administrative or governmental body
         pursuant to the Articles of Incorporation or Bylaws of Synbiotics, or
         any applicable Federal or California law, statute, rule or regulation;

     4.  The issuance of Preferred Stock to be issued to Redwood pursuant to the
         Agreement will be exempt from registration under the Securities Act of
         1933 and the issuance of those shares will be exempt from qualification
         under the California Corporations Code;

     5.  The shares of Common Stock of Synbiotics to be issued as a result of
         the consummation of the sale of Preferred Stock under the Agreement
         pursuant to certain employee retention agreements, as amended, have
         been registered under the Securities Act of 1933 and their issuance is
         exempt from qualification under the California Corporations Code; and

     6.  All capital stock of Synbiotics to be issued pursuant to the Agreement
         when issued will be duly and validly issued, fully paid, nonassessable
         and, to our knowledge, free from any claim of pre-emptive rights.

             Our opinions expressed above are specifically subject to the
following limitations, exceptions, qualifications and assumptions:

                a.  We express no opinion as to the Company's or this
                    transaction's compliance or noncompliance with applicable
                    federal or state antifraud or antitrust statutes, laws,
                    rules and regulations or Section

                                       3



Redwood West Coast, LLC
January 25, 2002


               721 (as amended by Section 5021 of the Omnibus Trade and
               Competitiveness Act of 1988: the so-called "Exon-Florio"
               provision) of the Defense Production Act of 1950 and the
               regulations thereunder.

          b.   We express no opinion concerning the past, present or future fair
               market value of any securities.

          c.   Our opinion in paragraph 3 is limited to laws and regulations
               normally applicable to transactions of the type contemplated in
               the Agreement and does not extend to licenses, permits and
               approvals necessary for the conduct of the Company's business. In
               addition and without limiting the previous sentence, we express
               no opinion herein with respect to the effect of any land use,
               safety, hazardous material, environmental or similar law, or any
               local or regional law. Further, we express no opinion as to the
               effect of or compliance with any state or federal laws or
               regulations applicable to the transactions contemplated by the
               Agreement because of the nature of your business. Also, we
               express no opinion with respect to any patent, copyright,
               trademark or other intellectual property matter, or as to the
               statutes, regulations, treaties or common laws of any nation,
               state or jurisdiction with regard thereto.

          d.   In connection with our opinion in paragraph 3 relating to the
               Company's material agreements, we have not reviewed, and express
               no opinion on, (i) financial covenants or similar provisions
               requiring financial calculations or determinations to ascertain
               whether there is any such conflict or (ii) provisions relating to
               the occurrence of a "material adverse event" or words of similar
               import. In addition, our opinion relating to such material
               agreements is subject to the effect of judicial decisions which
               may permit the introduction of extrinsic evidence to interpret
               the terms of written contracts or allow non-written modifications
               of written contracts. Moreover, to the extent that any of such
               material agreements are governed by the laws of any jurisdiction
               other than the State of California, our opinion relating to those
               agreements is based solely upon the plain meaning of their
               language without regard to interpretation or construction that
               might be indicated by the laws governing those agreements.

          e.   We express no opinion as to your compliance with any Federal or
               state law relating to your legal or regulatory status or the
               nature of your business.

          f.   We express no opinion as to the effect of subsequent issuances of
               securities of the Company, to the extent that further issuances

                                       4



Redwood West Coast, LLC
January 25, 2002

                    which may be integrated with the Closing or with the Common
                    Stock issuances under the amended employee retention
                    agreements may include purchasers that do not meet the
                    definition of "accredited investors" under Rule 501 of
                    Regulation D and equivalent definitions under the California
                    "blue sky" laws, to the extent that Section 4.15 of the
                    Agreement might in some scenarios require the issuance of
                    more shares of Preferred Stock than remain authorized but
                    unissued, and to the extent that the outstanding shares of
                    Preferred Stock are currently and may in the future be
                    convertible for more shares of Common Stock than remain
                    authorized but unissued at any time.

               g.   We remind you that by its terms the Preferred Stock is not
                    yet convertible into Common Stock and will not be so unless
                    and until the Company's Articles of Incorporation are
                    amended to increase the number of authorized shares of
                    Common Stock; and indeed, the Company today does not have
                    enough authorized and unissued Common Stock to enable full
                    conversion of the Preferred Stock even if the Preferred
                    Stock were convertible today.

               h.   We express no opinion as to the effect on the liquidation
                    provisions of the Articles of Incorporation of California
                    law, Federal law or equitable principles restricting in
                    certain circumstances distributions by a corporation to its
                    shareholders, relating to dissenters' rights or relating to
                    involuntary dissolution.

          This opinion letter is rendered as of the date first written
above solely for your benefit in connection with the Agreement and may not be
delivered to, quoted or relied upon by any person other than you, or for any
other purpose, without our prior written consent. Our opinion is expressly
limited to the matters set forth above and we render no opinion, whether by
implication or otherwise, as to any other matters relating to the Company. We
assume no obligation to advise you of facts, circumstances, events or
developments which hereafter may be brought to our attention and which may
alter, affect or modify the opinions expressed herein.

          We advise you that one of our lawyers is a beneficial shareholder of
the Company.

                                                Very truly yours,


                                                BROBECK, PHLEGER & HARRISON LLP

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