I got a 13 month old Aussie in December, and right away my wife and noticed he did that reverse sneeze thing that so many people are familiar with. Fortunately, however, it totally cleared up in a few weeks, only to return...unfortunately...last month.
There is, of course, the possibility that he is allergic to something that is blooming (I live in a very rural part of southern California, USA, by the way, and it is now summer here). However, the thing that most predictably sets him off is when he is sleeping/resting, and then gets a little more (or very) active/excited, and particularly if he moves from our comfortably air conditioned house into the 80-90+ degree heat of the outside world. That, to me, doesn't take allergies off the table as a contributing factor, but suggests maybe that he has a general sensitivity that is triggered by changes in activity or temperature.
He had a blood test recently and everything was fine. He is horribly difficult at the vet (does not tolerate being restrained while examined) so I can't easily just have the vet stick her examination tools in his nose and throat. I will have my vet do that if necessary, but...knowing my dog...my vet will definitely say she can only do that under anaesthesia. We plan on doing that kind of more intrusive exam when my dog is under anaesthesia for something else (like teeth cleaning). My concern would be if the reverse sneezing is indicative of something like sinus cancer.
I gather there aren't really any cures for this, but if there is anything to treat this, thanks for letting me know. In case it is allergies, we are giving our dog a teaspoon of very local honey because we have heard that can help with allergies to local flora. We sometimes give him Benadryl, but don't want to regulalry give him something that is gonna make him drowsy. Are there any other anti-histamine meds we should consider that are safe and don't have side effects like sleepiness? Any other ideas?
Thanks in advance for any suggestions or advice at all!