A pug is a small, fat, short-haired dog with a flat face. a small short-haired dog with a wide flat face, a very short nose, and a curly tail (Probably from pug (17-19 centuries), perhaps from Puck; PUCKISH). Breed of toy dog that probably originated in China. Dutch traders brought it to England in the late 17th century. Squarely built and muscular, the pug has a short muzzle, tightly curled tail, large head, prominent eyes, and small, drooping ears. It stands 10-11 in. (26-28 cm) and weighs about 13-18 lbs (6-8 kg). Its short, glossy coat can be black, silver, or apricot fawn; there is a black mask on the face. Loyal and alert, pugs are valued as companions