Patterson Companies (PDCO) 10-Q 2019 Q3 Quarterly report

Exhibit 32.1

Certification of the Chief Executive Officer

pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906

of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Patterson Companies, Inc., (the “Company”) on Form 10-Q for the quarterly period ended January 26, 2019, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officer of the Company certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that, to his knowledge:

1. The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

2. The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

/s/ Mark S. Walchirk

Mark S. Walchirk

President and Chief Executive Officer

March 6, 2019