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 long hair like the Pekingese (but with short legs). Some of them have more short, curly hair. This is purely a choice made by the owners. 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. Floppy ears are covered with long fur, and the heavily furred tail is carried curled over the back. The coat may be of any color, though white and with blazes of grey are frequently seen. A very noticeable feature is the underbite, which is required in the breed standard.