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Inverted or reverse sneeze syndrome is characterized by a
series of rapid, loud, forced inhalations through the nostrils,
lasting anywhere from 10 seconds to 2 minutes.  Attacks
occur on a sporadic, unpredictable basis.  Dogs usually have
the head extended forward and stand still during the episode.
Affected dogs appear completely normal before and after the
attack. There is no loss of consciousness or collapse, though
sometimes the appearance of the dog is upsetting to owners.  
Many dogs have these attacks throughout their lives.
The exact cause of inverted sneezing is unknown, but it may
be associated with sinusitis and other respiratory disorders.  
Many believe affected dogs are consciously removing mucus
from the nasal passages. In fact, many dogs swallow at the
end of the attack. Whatever the cause, the condition is
usually not serious.
If inverted sneezing appears suddenly in an older dog, or if
episodes become more severe or frequent, the nasal
passages and throat should be examined.
McMillan Veterinary Clinic