My rabbit is losing the fur behind her neck. she has fleas. is the fleas causing this to happen or couldthis be fur mites? Also he is only 2 and a half weeks old. Is there anything I can treat her with that won't hurt her? she is in the house right now so she gets fleas from the cat who is also losing fur. I really want to help my rabbit. I've hand feed her since she was a week old when her mother died.