My bulldog just started coughing like he does from time to time, but this time it was a wheezing sound and then the hacking cough sound. Not brought on by anything--wasn't eating, drinking, exercising--just sitting and then got up to go outside. No vomit. Breathing normally in between the wheezing coughs. This lasted for about 5-10 minutes and now he is laying down to go to sleep. Any thoughts? I looked at tracheal collapse but it doesn't seem to fit.