CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the incorporation by reference in the Registration Statements on Forms S-8 (Nos. 333-137497, 33-56764, 333-03583,
333-45742, 333-87488, 333-101691, and 333-114643) and the Registration Statements on Forms S-3 (Nos. 333-19951, 333-41199, 333-61489, 333-79147, and 333-116226) of Patterson Companies, Inc. of our reports dated June 23, 2010, with respect to
the consolidated financial statements and schedule of Patterson Companies, Inc., and the effectiveness of internal control over financial reporting of Patterson Companies, Inc. included in this Annual Report (Form 10-K) for the year ended
April 24, 2010.
/s/ Ernst & Young LLP
June 23, 2010