Japanese Chin stand about 20 to 27 cm (8 to 11 in) in height at the withers and weight can vary from a low of 4 lbs to a high of 20 lbs, with an average of 7 to 11 pounds being the most common.
This breed is considered one of the best cat-like of the dog breeds in attitude: it is alert, intelligent, and independent, and it uses its paws to wash and wipe its face. Other cat-like traits include their preference for resting on high surfaces such as the backs of sofas and chairs, their ability to walk across a coffee table without disturbing an item, and some of the surprising places their owners often find them in. They rank 62nd in Stanley Coren's The Intelligence of Dogs, being of fair working/obedience intelligence. A companion dog, it is loving and loyal to its owner and typically happy to see other people, though a few are distrustful of strangers. Chin prefer familiar surroundings, but do quite well in new situations and are often used as therapy dogs because of this trait and their love of people. Very early socialization of Chin puppies leads to a more emotionally well-balanced Chin that is more accepting of different situations and people.
The Chin will bark for the purpose of alerting the household to the arrival of a visitor or something out of the ordinary, but are otherwise very quiet.
Chin were bred for the purpose of loving and entertaining their people. While typically a calm little dog, they are well known for performing many enjoyable antics such as the “Chin Spin,” in which they turn in rapid circles; dancing on their hind legs while pawing their front feet, clasped together, in the air; and, some even “sing,” a noise that can range from a low trill to a higher, almost operatic quality noise, and which sounds much like “boooo.”
This breed's flattened face contributes to a few Chin suffering from breathing and heart problems, as is common with brachycephalic breeds. Because they are a brachycephalic breed, temperature extremes (particularly heat) should be avoided. Luxating patellas (knees) and heart murmurs are other genetically predisposed conditions. The oversized eyes are easily scratched and corneal scratches or more serious ulcerations can result. Mild scratches benefit from topical canine antibacterial ointment specifically for eye application; more serious injury or ulcerations require urgent medical care. The Chin, as with most small breed dogs, can also have a risk of hypoglycemia when under the age of 6 months; this concern can continue in Chin that mature at 4 to 5 pounds or less. Some Chin do have seasonal allergies.
