The American Animal Hospital Association (AAHA) is an international association of more than 42,000 veterinary care providers who treat companion animals. Established in 1933, AAHA is well known among veterinarians and pet owners for its standards for hospitals and pet health care. Approximately 3,200 veterinary hospitals voluntarily participate in the AAHA hospital evaluation program. Consultants regularly visit these hospitals to ensure compliance with AAHA’s standards for services and facilities.
AAHA is the only organization that accredits animal hospitals throughout the U.S. and Canada. AAHA-accredited hospitals voluntarily choose to be evaluated on 900 standards in the following areas: quality of care; diagnostic & pharmacy; management; medical records; and facility.
http://www.healthypet.com/Accreditation/ReferralHospitals.aspx