I have a calk that is about 4 months old. For two weeks he has had a dry cough, made worse when active. Doctored him with LA 200 and Sulfa, he didn't get any better. Two seeks later we branded him but sis not cut him. Gave him penecillan and black leg vaccine. a week later(yesterday) I got him in to give him some more LA and sulfa. After the little bit of walking, he never ran or got pushed around, he started kind of puking up or coughing up something that looks like curdled milk but has the odor of infection. It isn't green and there is no blood in it. Any way I gave him his shot and the Sulfa. Today he is down with what appears to be black leg. He has crinkly skin around his neck, the skin on his stomach sounds hollow and he has swelling under his jaw. And where I gave him his shots he has some pretty good sized knots. Any ideas on what this could be. He is one of my barn calves.