There are two kinds of allergy-related questions: human allergies to pets, and pets' allergies. I asked a question about the former and tagged it allergies, but that doesn't leave room for separately tagging questions about the latter. (I have a cat with allergies and I anticipate asking questions related to that. Update: I've now asked a question about feline allergies too, using the same tag.)
Should we separate these cases? If so, what should the tags be called?