I have 2 Angora bunnies,Biscuit & Casper, they are brothers 4 years old. Biscuit got a lung infection earlier this year and after daily injections he finally recovered and is doing fine. A couple of weeks ago he contracted an upper respiratory cough and now both Rabbits have the same cough. Medicine doesn't seem to help, so the vet has Biscuit on a daily injection but that is not helping. I really hate to see them suffer but I don't know what else to do! Any suggestions?