Dog won't stop hacking, coughing, and vomiting - even with meds!?

He may need a longer course of medication. Kennel cough is a virus and it needs to run it's course. I know the cough sounds ruff, but there isn't much you can do. The meds are mostly to help with the symptoms, but like I said it might need another week or so to clear up either without med or with them.