I tried this item and so far it's very cool. I hope you continue to develop it.
Have you thought about adding more things, like:
Condition: 1-10 = ("antibotics kit" shop item to fix)
Hygiene: 1-10 ("grooming kit" shop item to fix)
I also have a problem, but maybe I'm not doing it right. I'm trying to use a "cage", but get this message:
This item requires further input. Please complete the fields below, and then press "Use Item"
You already have too many pets to use this item. Using it will just result in item loss.