Bred for centuries as a companion, the pug is a dual-personality dog. Content to share a sofa with his people, he is also active and playful. The pug is capable of great charm and dignity, and he wins friends and influences people with his outgoing, loving disposition. And his small size makes him suited to any home, from city pied-a-terre to country estate. With all of those advantages, it's not surprising that the pug is one of the most popular breeds in the United States.