“Animal shelter” means a facility operated, owned, or maintained by a duly incorporated humane society, animal welfare society, or other non-profit organization for the purpose of providing for and promoting the welfare, protection, and humane treatment of animals. “Animal shelter” also means any veterinary hospital or clinic operated by a veterinarian or veterinarians licensed under the Veterinary Medicine and Surgery Practice Act of 2004 which operates for the above mentioned purpose in addition to its customary purposes.