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"Patellar luxation is a common, mildly to severely painful condition in domestic dogs.   Basically, the patella (kneecap) slips out of place for some reason, resulting in lameness, weakness and pain.  It is most commonly seen in young miniature and toy breeds, although any age, gender or breed of dog can develop the disorder."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Patellar-Luxation/Symptoms.aspx>