Banfield Pet Hospital is a privately owned company based in Vancouver, Washington, United States, that operates veterinary clinics. Part of the Mars Inc. family of companies, Banfield owns clinics in the United States, Mexico, and the United Kingdom. Founded in 1955, the company operates many of its 1,000 plus clinics inside PetSmart stores. Banfield is the largest privately owned veterinary practice in the United States. On April 2, 2014, Banfield Pet Hospital announced its headquarters would be relocating to Vancouver, Washington, from nearby Portland, Oregon.