Chihuahua (dog)

Chihuahua (dog), breed of toy dog, descended from an ancient breed known to the Toltec people in Mexico in the 9th century. The modern breed was first discovered about 1850 in the state of Chihuahua, Mexico, from which it took its name. Two types exist, one with a smooth coat and one with a long-haired coat. The chief characteristics of both types are a well-rounded head, a slightly arched neck, a level back, and a moderately long tail. The ears, which usually are erect and large, tend to flare outward. The Chihuahua weighs 0.5 to 4 kg (1 to 8 lb) and may be of any color from white to black.