Your vet may know something we don't know! I did see this on one site:
Quote:
Kennel cough
High, dry coughs are typical of kennel cough or acute tracheobronchitis. A dog with kennel cough seems to feel fine otherwise. Cases usually heal in about two weeks, but the frequent bouts of coughing can be annoying to the owner who lies awake listening to his pet hack away. Treatment includes isolation to avoid infection of other family or kennel dogs, monitoring of temperature, rest, and if the coughing is severe, use of a children's over-the-counter cough syrup. A humidifier can help the dog breathe easier and thus reduce coughing and further throat inflammation.
Kennel cough in puppies and toy breeds can be another story; the throat irritation can be accompanied by thick secretions that can cause pneumonia.
Dog Owner's Guide:Canine Coughs |
So this sounds like kennel cough is harder on the toy breeds like yorkies.
Remember coughing is nature's way of getting the mucus out of lungs, the right type of cough syrup with an expectorant helps the cough be more productive, you don't want to just stop the cough, you want to make it productive. Also, other things can cause coughing such as distemper, so you want to make sure it's diagnosed properly.