The pug is a breed of dog with physically distinctive features of a wrinkly, short-muzzled face, and curled tail. The breed has a fine, glossy coat that comes in a variety of colours, most often fawn or black, and a compact square body with well-developed muscles. China is the earliest known source for the breed. Similar dogs were popular in the Imperial court during the Song Dynasty. Dogs of China & Japan, in nature and art. W. Heinemann, London.