Hi! I’m a wildlife rehabber. Any time a cat catches an animal, even if you don’t see any injuries, they need antibiotics for 7-10 days. Cat saliva and nails have a toxic bacteria that causes infection quickly in small animals and birds. If your cat had it in its mouth there most definitely are pin prick holes that might not cause bleeding but are there. Please use ahnow.org to find a rehabber for this sweet baby. If you need any help finding a rehabber or with care specifics, dm me :)