@Kevin1322 Probably because they still have hair and shed, and they still have claws that can scratch furniture, the fact that they are not pets doesn't eliminate the negatives that come with animals or the extra cleaning required.
@Keisha35 No, you can neither charge extra or refuse a service animal or an emotional support animal.
I know it differs from country to country but isn't that sort of thing built into your overheads. A certain percentage of people will have service animals, most likely a companion animal or guide dog.