This is a hearty breed in general, but Pyrenean Shepherds can have trouble with slipped kneecaps, hip dysplasia, and retinal atrophy. (dogster.com)
Hopefully, the patient will be able to slip the kneecap back where it belongs and be back to normal in only a few steps. (marvistavet.com)
It is susceptible to a toy dog structural abnormality known as patellar luxation (dislocated or slipping kneecaps), so puppies should be purchased from breeders who test breeding stock for this problem. (canismajor.com)