Chihuahuas are named for the Mexican state of Chihuahua, and the AKC registered its first one in 1904. They come in smooth and long coats, with an apple-shaped head, large upright ears and nearly any color. Most weigh well under ten pounds, though adoptable dogs sometimes run a bit larger.
Many Chihuahuas are bold, alert and devoted to their favorite people. That confidence can show up as barking, wariness of strangers or snapping when handled roughly, so gentle socialization matters. Temperament varies, and some are mellow lap dogs while others are more reactive. Chihuahuas and Chihuahua mixes are among the most common small dogs in shelters, so adults of every age and personality are often waiting for homes.