I'm in the same boat as you about the vet. Pus can form from any infection. Usually why there is pus if there is bacteria in there. The only thing that I can think of from horses and cows is hoof rot but I believe that's a fungus. If not than bacteria but chickens don't have hooves and I don't think horses and cows get bumble foot. I can't really think of a disease they all share off the top of my head. What did he do with the q-tip? If he threw it away right a way I would probably call him on it. Cancer is do to abnormal cellular growth. Wonder what he meant by duct. I would give him the antibiotic, really like nothing bad could come from the antibiotic right now. Syringe feed him and maybe give him some electrolytes in his water. I honestly don't know what else you could try. Electrolytes might give him some energy to try to fight the infection with the antibiotic. In all honesty though I would call the vet on his stuff. Antibiotics wouldn't really help with cancer. Antibiotics are more for bacteria or a virus. Also this vet must have never worked with a cow with an abscess. They can be as hard as a rock and smell terrible and can be a little gross when you rupture them. Also I can't think of a foot bacteria that comes from both livestock and poultry off the top of my head. This vet sets off a few red flags in my opinion.
