Does your dog have papers? I had a similar issue trying to rent our house as well as the apartment before. My vet told me that because I don't have papers I can't prove he's pure APBT, and likewise neither can anyone else. He had me tell my prospective landlords that ace is a terrier mix/mut. When you look at him he's clearly pit, and the apartments, who also had us do a dog interview tried to tell me they don't rent to pit mixes. My reply was, "if I can't prove his breed on paper, then you can't tell me he's pit, poodle, or anything else". I paid my pet deposit and moved in.