PetSmart, Inc. (NASDAQ: PETM) is a retail chain doing business in the United States and Canada engaged in the sale of specialty pet supplies and services such as grooming and dog training, PetSmart PetsHotel dog and cat boarding facilities and Doggie Day Care. The name PetSmart was coined as a pun, since its name serves both as Pet Smart and Pets' Mart.

PetSmart was founded in 1986 and opened its first Pet Food Warehouse stores in the Phoenix area. Through several mergers and acquisitions, PetSmart expanded in the early- and late-1990s across the U.S. and into Canada, and entered online retailing through a partnership with Idealab in 1999.

In early 2000, PetSmart remodeled most of its store in a plan they called "Eagle" which changed many of its stores from a front-half storefront, back-half warehouse feel to an all-over standard retail market, in hopes of not intimidating customers.

In August 2005, the company announced that it was rebranding its name from PETsMART to PetSmart. This move is designed to emphasize its evolution from a pet supply store to a solutions-oriented company.

As of November 2007, PetSmart operated approximately 1,000 stores and about 150 locations with PetsHotels and Doggie Day Camps. Some PetSmarts are co-located with Banfield Pet Hospital veterinary offices.