I am wondering if this is a service animal or another "therapy" animal. Bona fied service animals are rare. Therapy animals are everywhere. Tenants use this ruse to sneak pets in the back door. Therapy animals have only came about in the last ten years. Before then they were just pets. Have you ever seen a therapy animal on an airplane? There are only pets on an airplane and they are in cargo. People who habor these therapy animals have more problems than an animal can solve. If you allow them, they will make some of those problems yours.