As filed with the Securities and Exchange Commission on June 13, 2001
                                                       Registration No. 33-24444
================================================================================



                    U.S. SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                             --------------------

                        POST-EFFECTIVE AMENDMENT NO. 1
                                      TO
                                   FORM S-8
                                     UNDER
                          THE SECURITIES ACT OF 1933


                            SYNBIOTICS CORPORATION
               (Name of registrant as specified in its charter)


                                                    
             California                                           95-3737816
(State or other jurisdiction of incorporation          (I.R.S. Employer Identification No.)
           or organization)

                11011 Via Frontera
              San Diego, California                                    92127
     (Address of principal executive offices)                        (Zip Code)



                 SYNBIOTICS CORPORATION 1988 STOCK OPTION PLAN
                           (Full title of the plan)

                               MICHAEL K. GREEN
               Senior Vice President and Chief Financial Officer
                            SYNBIOTICS CORPORATION
                11011 Via Frontera, San Diego, California 92127
                    (Name and address of agent for service)

                                (858) 451-3771
         (Telephone number, including area code, of agent for service)

                                  Copies to:
                            HAYDEN J. TRUBITT, ESQ.
                        BROBECK, PHLEGER & HARRISON LLP
                             12390 El Camino Real
                              San Diego, CA 92130

This registration statement shall become effective immediately upon filing with
the Securities and Exchange Commission, and sales of the registered securities
will begin as soon as reasonably practicable after such effective date.

================================================================================


                            SYNBIOTICS CORPORATION

                                Deregistration
                             ----------------------

This registration statement registered 80,000 shares of the Common Stock of
Synbiotics Corporation (the "Company"). These shares were offered pursuant to
the Company's 1988 Stock Option Plan (the "Option Plan"). 8,711 shares have been
issued under the Option Plan. The remaining 71,289 stock options outstanding
under the Option Plan have been rolled into the Company's 1995 Stock
Option/Stock Issuance Plan, separately registered under a Form S-8 registration
statement filed with respect to the 1995 Stock Option/Stock Issuance Plan.

Accordingly, the Company hereby deregisters 71,289 of the Common Stock
originally covered by the registration statement.

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                                  SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing on Form S-8, and has duly caused this registration
statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of San Diego, State of California, on June 13, 2001.

                            SYNBIOTICS CORPORATION

                            By   /s/ Michael K. Green
                                 ------------------------
                                 Michael K. Green
                                 Senior Vice President


Pursuant to the requirements of the Securities Act of 1933, this registration
statement has been signed by the following persons in the capacities and on the
dates indicated.



               Signature                                           Title                                 Date
- -----------------------------------           ------------------------------------------------     -----------------
                                                                                             

       /s/ Paul A. Rosinack                   Chief Executive Officer, President and Director      June 13, 2001
- ----------------------------------            (Principal Executive Officer)
         Paul A. Rosinack

       /s/ Michael K. Green                   Chief Financial Officer (Principal Financial         June 13, 2001
- ----------------------------------            Officer)
         Michael K. Green

       /s/ Keith A. Butler                    Corporate Controller (Principal Accounting           June 13, 2001
- ----------------------------------            Officer)
         Keith A. Butler

      /s/ Patrick Owen Burns                  Director                                             June 13, 2001
- ----------------------------------
        Patrick Owen Burns

        /s/ Rigdon Currie                     Director                                             June 13, 2001
- ----------------------------------
          Rigdon Currie

      /s/ James C. DeCesare                   Director                                             June 13, 2001
- ----------------------------------
        James C. DeCesare

       /s/ Joseph Klein III                   Director                                             June 13, 2001
- ----------------------------------
         Joseph Klein III

      /s/ Donald E. Phillips                  Director                                             June 13, 2001
- ----------------------------------
        Donald E. Phillips


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