The shih tzu is often slightly longer than tall, with a sturdy body and a good-sized head. The muzzle is quite short, with an undershot bite. The head is rounded and the eyes are quite prominent. The tail is carried gaily curled up over the back. ( Black shaded) The Maltese Shih Tzu, also known as the Mal-Shi, Malti zu, and the Malt-Tzu, is a hybrid or mixed dog breed — a cross between the Maltese and Shih Tzu breeds. ( White and Red shaded)