Chihuahuas take their name from the Mexican state of Chihuahua, and the AKC registered its first one in 1904. They have an apple-shaped head, large upright ears and a smooth or long coat in nearly any color. Show-ring Chihuahuas stay under six pounds, but adoptable dogs often run bigger, so expect anywhere from 3 to 9 pounds.
The personality is large for the size: alert, loyal and often devoted to one or two people, with some wariness of strangers. In a mostly single-family city like St. Peters, that watchfulness tends to show up as barking at the mail carrier or a neighbor's dog. Chihuahuas can live 12 to 16 years, so adoption is a long commitment. Each dog varies, and adults of many temperaments are common in rescue.