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. The breed eventually became popular in other European countries as well. Pugs were painted by Goya in Spain, and in Italy they rode up front on private carriages, dressed in jackets and pantaloons that matched those of the coachman. They were used by the military to track animals and people, and were also employed as guard dogs.