Final answer:
The American Animal Hospital Association (AAHA) accredits veterinary hospitals based on high standards of excellence in various areas.
Step-by-step explanation:
The professional agency that accredits veterinary hospitals based on standards of excellence concerning facility design, equipment, patient care, medical records, inventory control, client communication, and marketing is the American Animal Hospital Association (AAHA). AAHA is a nonprofit health organization that sets high standards for veterinary hospitals and provides accreditation to those that meet these standards.