Well, the little tri-colored house bunny that my daughter brought home went through 2 courses of Baytril and took a turn for the worse right before I left on vacation. He was lethargic, with ears down, and just looked miserable. I brought back penicillin from Mexico, and persuaded DD to try it along with the Baytrill. After 3 days, Tobey responded! He sropped rattling (lungs) about three days ago. His eyes are still a little goopy, but I'm hoping they will clear up before he finishes his course of penicillin. And, he's in here visiting me while I'm on the computer. This was a case of kill or cure. I wonder if the combination of the two antibiotics was the key, or if it was the penicillin?