Common health issues in the Japanese Chin include luxating patellas (slipping kneecaps), cataracts, and early-onset heart murmurs. The Chin, as with most small breed dogs, can also have a risk of hypoglycemia when aged under six months or weighing four to five lbs or less. Some Japanese Chin have seasonal allergies. The Japanese Chin's coat requires weekly brushing or combing, with special attention being given to the skirt and the area under the ears and legs. They do not require frequent bathing. They do not require frequent bathing. These dogs are single-coated and single-hair shedders, and it is very seldom one will find a Chin with an undercoat. A Japanese Chin will have a light blowing of their coat once a year.