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. In ancient times, Pugs were bred to be companions for ruling families in China. The pet Pugs were highly valued by Chinese Emperors, and the royal dogs were kept in luxury and guarded by soldiers. Pugs later spread to other parts of Asia. In Tibet, Buddhist monks kept Pugs as pets in their monasteries. The breed has retained its affectionate devotion to its owners since ancient times.