We got a pup some years ago from a dogs home. (Abby who is now a very old lady!) Pup had been innoculated etc. at the home. We brought her home and she was fine. About a week later, our older dog Ben, started with kennel cough and had to go to the vets. He was really sorry for himself. Abby who we suspect must have brought the cough in to our home, was fine, no symptoms at all.