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. Pugs' legs are strong, straight, of moderate length (although they fall under the class of short in comparison to the main body), and are set well under. Their shoulders are moderately laid back. Their ankles are strong, their feet are small, their toes are well split-up, and their nails are black. The lower teeth normally protrude further than their upper, resulting in an under-bite.