Reverse Sneezing seems to be a quite common problem in dogs. My dog is no exception and has had that from time to time, even though the frequency has reduced as he grew older. Currently (he's 3 years old) it happens only a few times during the year and mostly on Spring. Anyway, when he first had reverse sneezing episodes, we talked with the vet and sent him the following videos for a more accurate "diagnosis". The vet told us the same way humans sneeze, dogs sort of do the same but it's not a reason to worry unless it happens all the time. Here's a more technical definition for those interested.
