Location: South East UK
Joined: Mar 2005
Although I've witnessed it before, and many a time with Zena, this morning's was quite worrying, hence my Googling!
Apparently, it's not caused by anything serious, this is some information I found on it:
QUOTE ""Paroxysmal Respiration" - the official veterinary term for reverse sneezing - is caused by a spasm of the dog's soft palate. (The soft palate is the soft tissue in back of the roof of the mouth, behind the hard palate.) Reverse sneezing looks and sounds very much like the dog is trying to inhale a sneeze. The dog acts and breathes normally before and after an episode, with no after effects.
Reverse sneezing is sometimes caused by mild irritation to the nasal or laryngeal area. It can sometimes be triggered by rapid eating or drinking, by running or pulling on a leash, by being excited or frightened. In some cases there is no obvious reason for it. Although dogs of any size and any breed can experience reverse sneezing, it's more common in small dogs. Brachycephalic breeds like Bulldogs, Boxers, Pugs, Boston Terriers, Shih Tzus and other short-faced breeds are also more prone to this condition. Some dogs will have occasional episodes, perhaps a few times a week or a few times a month. Others may have only a few isolated bouts of reverse sneezing during their entire life." unquote