I have 3 boer goats, and at least two of them are still coughing. I treated them all with a single dose of Ivomec (for lung worm) last Sunday, and have done 7 days worth of Neomyacin (in case of Pasturella or ...) and there still seems to be a cough in the herd. The one doe is pregnant (and she was coughing alot this am), so I don't want to over-drug. Should I give another oral dose of Ivomec or try a Penicillin or just call a Vet to show up? Any thoughts. I'm in Michigan and it is cold. I'm not sure if that is part of the issue.