The Chihuahua is a balanced, graceful dog of terrier-like demeanor, weighing no more than 6 pounds. The rounded “apple” head is a breed hallmark. The erect ears and full, luminous eyes are acutely expressive. Coats come in many colors and patterns and can be long or short. The varieties are identical except for coat, according to AKC.

Chihuahuas possess loyalty, charm, and big-dog attitude. Even little dogs require training, and without it this tiny pup will rule your household like a little Napoleon. Compact and confident, Chihuahuas are ideal city pets. They are too small for roughhousing with children, and special care must be taken in the cold weather, but Chihuahuas are adaptable—if they get lots of quality time in their preferred lap, according to AKC.