Chihuahuas are Mexican in origin, named for the state of Chihuahua, and the AKC has registered them since 1904. They come in smooth and long coats and nearly any color, with an apple-shaped head and big upright ears. Most adoptable Chihuahuas weigh between 3 and 9 pounds and live 12 to 16 years, so adopting one is a long commitment.
Personality varies, but many are alert, loyal to one or two people and quick to bark at visitors. Early, gentle socialization helps a wary dog relax, and quiet-time training keeps barking from bothering neighbors. Coats need little work beyond regular brushing, though long coats take more. Chihuahuas often do best with adults or gentle older children, and an adult dog's temperament is usually easier to read than a puppy's.