My 12 lb poodle mix has had a problem with reverse sneezing since I rescued him in 2011 at age 1.5. Usually his episodes last only a few seconds and he calms down when I pet him or comfort him. However, as of right now it has been about 16 hours that he’s been doing it off and on and I’m terrified. Yesterday around 3 pm I let him outside to play in the sunshine for a bit, I watched him. After being outside for only 5 or 6 minutes he went into a reverse sneezing fit. I pet him and he calmed down and then brought him back inside. Normally once he’s done with the fit he doesn’t do it again for days or weeks. Yesterday, though, it kept happening. He would go into a fit after just walking around. I’ve had him laying in his doggie bed since the first episode and he hasn’t moved around much on his own.