The AKC standard describes the Chihuahua as a graceful, alert, swift-moving dog with saucy expression and terrier-like qualities of temperament. The breed comes in two coat varieties that are shown separately at AKC events: the smooth coat with short, close-lying fur; and the long coat with a soft, flat or slightly wavy texture and feathering on the ears, legs, tail, and ruff around the neck.
Both varieties are built to a compact, well-rounded body with an apple-domed skull — the defining head type in the US standard. Colors are unrestricted and include every pattern from solid to merle, though breeders have noted that the merle gene carries health risks in some combination patterns. Weight is not to exceed six pounds per the AKC standard. The eyes are full, round, and luminous; the ears large and erect. Small but never dainty, the correctly proportioned Chihuahua moves with brisk, energetic strides.