Actually to plays devils advocate, it takes awhile for any germs to build up resistance to antibiotics. It wouldn't happen after a month or 2 of treatments and even if it did become resistant, there are other antibiotics that can be use used. Regardless though, I still stick by my other posts and most of them here and say you need a vet as like I said, baytril is strong and can hurt an animal just as well as help it and again it is useless against viruses which can also show up as RI.