Do Shih Tzu's have many health problems?

There are several congenital diseases, including: patellar luxation, Stenotic Nares, Cherry eye, back problems and eye abnormalities. The patella or kneecap is usually located directly in the center of the knee joint. Luxation, or dislocation of the patella, occurs when the patella slides out of its groove. Stenotic Nares is a condition where the narrow resticted nostril puts a strain on the dog's system and can lead to an enlargement of the heart. In the Cherry eye condition, the gland of the third eyelid, which produces about one-third of the tear film, prolapses as a pink fleshy mass protruding over the edge of the third eyelid, between the third eyelid and the cornea (clear front part of the eye that provides the first step in the collection of light). (all known from her own shih-tzu)