Sometimes your dog may make a loud snorting or inhaling sound that's best described as reverse sneezing. During a reverse sneeze, which usually lasts about a minute, your dog may stiffen his stance and extend his head, and his eyes may bulge. Although the episode may be unnerving, it's usually caused by something harmless, such as leash pulling or excitement. Massaging your dog's throat, offering him something to lick, or placing your fingers over his nostrils may cause him to swallow, which may stop the sneeze. But check with your veterinarian if it happens often. It may be a sign of allergies, mites, infection, foreign body, or another medical condition.