We were babysitting my sister-in-law's dogs last week and we woke up one morning to hear this:

We went to the vet and found out he has Kennel Cough, or infectious canine tracheobronchitis. It sounds awful and is highly contagious. Tucker has been vaccinated, but we learned that the kennel cough vaccination is similar to a flu shot in that if the particular strain the dog is exposed to doesn't match what's in the vaccination, it is not effective. The incubation period is anywhere from a couple of days to a couple of weeks, from what I've read, and the vet said they don't consider a dog "well" until they haven't coughed for two weeks. We've isolated Tucker and cleaned everything we could, to try to protect the other dogs (who all also received their vaccinations), but odds are they've already been exposed because the germs are spread via the air. Bottom line, if your dog starts coughing like Tucker, try to keep him away from other dogs so it doesn't spread- but if it does, don't worry too much, it's usually not serious. And get him to the vet. There are medicines to suppress the cough and to fight the infection.

And by the way, did you notice that his tail looks like a microphone?