Chihuahuas take their name from the Mexican state of Chihuahua and are among the smallest dogs in the world, usually 3 to 9 pounds, with an apple-shaped head and large upright ears. They come in smooth or long coats and nearly any color. A smooth coat needs little more than a weekly brushing, while a long coat needs a few more sessions.
Many Chihuahuas are devoted to one or two people and act far bigger than they are, which can mean barking and wariness of strangers. They're among the most common small dogs in shelters, so adults of different ages and personalities turn up often. Each dog is different, so pay attention to how a dog reacts to noise, handling and new people.