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. Pugs are known for being sociable and gentle companion dogs. The American Kennel Club describes the breed's personality as 'even-tempered and charming'. Pugs remain popular into the twenty-first century, with some famous celebrity owners. A pug was judged Best in Show at the World Dog Show in 2004. China is the earliest known source for the breed. Similar dogs were popular in the Imperial court during the Song Dynasty.