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. A Pug travelled with William III and Mary II when they left the Netherlands to accept the throne of England in 1688. During this period, the Pug may have been bred with the old type King Charles spaniel, giving the modern King Charles Spaniel its Pug characteristics.