We have a 6 month old rooster that has always been free range & extremely healthy. Now is very poor. Won't eat or drink. Sounds horrible in his chest. Like respitory. Today has a horrible odor. Have been giving vet rx & oxytetracyclin but don't seem to be working at all. Need to know if there is anything we can get for him & what is the best. He really needs some kind of shot. PLEASE HELP! WE'RE DESPERATE!!!!