Patterson Companies (Nasdaq: PDCO) today announced that it will hold its conference call to review operating results for the fourth quarter of fiscal 2009 on Thursday, May 21 at 10:00 AM Eastern. The Patterson earnings release will be issued before the market opens that day.

Investors can access a live webcast of the conference call by visiting the investor relations section of the Patterson Companies website, www.PattersonCompanies.com. The webcast will be archived on Patterson’s website. Following the conference call, a replay will be available at 303-590-3000 with the 4077393 Conference ID through May 28.

About Patterson Companies, Inc.
Patterson Companies, Inc. is a value-added distributor serving the dental, companion-pet veterinarian and rehabilitation supply markets.
Dental Market
As Patterson’s largest business, Patterson Dental provides a virtually complete range of consumable dental products, equipment and software, turnkey digital solutions and value-added services to dentists and dental laboratories throughout North America.
Veterinary Market
Webster Veterinary is the nation’s second largest distributor of consumable veterinary supplies, equipment and software, diagnostic products, vaccines and pharmaceuticals to companion-pet veterinary clinics.
Rehabilitation Market
Patterson Medical is the world’s leading distributor of rehabilitation supplies and non-wheelchair assistive patient products to the physical and occupational therapy markets. The unit’s global customer base includes hospitals, long-term care facilities, clinics and dealers.

Patterson Companies
R. Stephen Armstrong, 651-686-1600
Executive Vice President & CFO
or
Equity Market Partners
Richard G. Cinquina, 904-415-1415