The Shih Tzu is a sturdy little dog with a short muzzle and large dark brown eyes. They have a soft and long double coat. Although sometimes long, a Shih Tzu will not always have extremely lengthy hair like the Pekingese (but with short legs). A Shih Tzu should stand no more than 26.7 cm at the withers and with an ideal weight of 4.5 to 7.3 kg. The traditional long silky coat, which tends to reach the floor, requires daily brushing to avoid tangles. Because of their long coat and fast-growing hair, regular grooming is necessary, which may be expensive and should be taken into account when considering adopting one of this breed. This malfunction is commonly attributed to immune system problems. It usually affects middle-aged dogs and is seen in all breeds.