Exhibit 32.1 CERTIFICATION OF CHIEF EXECUTIVE OFFICER PURSUANT TO 18 U.S.C. SECTION 1350 (Section 906 of the Sarbanes-Oxley Act of 2002) I, Menderes Akdag, Chief Executive Officer (principal executive officer) of PetMed Express, Inc. (the "Registrant"), certify to the best of my knowledge, based upon a review of the Quarterly Report on Form 10-Q for the period ended December 31, 2003 (the "Report") of the Registrant, that: (1) The Report fully complies with the requirements of section 13(a) of the Securities Exchange Act of 1934, as amended; and (2) The information contained in the Report, fairly presents, in all material respects, the financial condition and results of operations of the Registrant. By: /s/ Menderes Akdag ----------------------------- Menderes Akdag Date: February 6, 2004