Hi, a couple of months ago I thought Dudley may have Kennel cough, took him to the vet who said he was completely healthy, no temp etc but that it could be from my description, so I kept him in for a while...until I noticed a small article about 'reverse sneezing' in a dog mag, did a bit of research (ie looked up vids on you tube!!) and decided that was definitely what he was doing, it can be caused by a soft pallet but I didn't think he had that, the article I read said often the cause is unknown but maybe allergies, and a friend said a previous dog of hers often did it in the spring. I decided Dudley had probably got something in his nose while out and about that caused it (allergic reaction), after about a week of it he stopped and hasn't done it since.