Chihuahua's head shapes vary a lot too, but most fall into the two mains groups of apple heads and deer heads. Large, erect ears sit above round, protruding eyes that give the breed a bright and curious look. You can find both long-haired and short-haired Chihuahuas with specific breed appearance standards for each. The Chihuahua has a swift, firm gait that helps him show off his proud appearance. In their eyes, Chihuahuas are the most important people in the room.