AAHA AAHA is an organization with a simple mission: to accredit veterinary practices who demonstrate excellence in everything they do. Hospitals are routinely examined and tested on approximately 900 variables of running a truly exceptional veterinary hospital. Because of the stringent standards and voluntary nature, fewer than 15% of veterinary practices earn accreditation. We are proud to be one of the few. Because when it comes to your pet, only the best will do.