We spent several hundred $$$ taking Bo to an allergy specialist. We opted to not have test after test done on her. Her culture came back that she has a bacteria (long name and can't remember) and it's one of the nastiest kind. Only a certain antibiotic will work on it, which we've adminstered several times now, but it just keeps coming back. *sigh* It's hard on all when we can't get to the bottom of these problems and get them cleared up. Good luck to you and Luna and ridding this once and for all.