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. 1 Description. Pugs have two distinct shapes for their ears, 'rose' and 'button'. 'Rose' ears are smaller than the standard style of 'button' ears, and are folded with the front edge against the side of the head. Breeding preference goes to 'button' style ears.