Pug, breed of toy dog that probably originated in China and was introduced to England near the end of the 17th century by Dutch traders. The Pug has a short muzzle and a tightly curled tail. It is a squarely built muscular dog with a large head, prominent dark eyes, and small drooping ears. At maturity it stands 10 to 13 inches (25.5 to 33 cm) tall at the withers and weighs about 14 to 18 pounds (6 to 8 kg). Its coat is short and glossy; colour is given in the breed standard as black or as silver or apricot fawn with a black line on the back and a black mask on the face. Typically loyal and alert, the Pug is a valued companion dog.