Additional information (Wiki):Being naturally territorial and protective, Chihuahuas can be easily provoked to attack, and are therefore generally unsuitable for homes with small children, but not in all cases. The AKC describes the breed as, "A graceful, alert, swift-moving little dog with saucy expression, compact, and with terrier-like qualities of temperament." The breed tends to be fiercely loyal to one particular owner, but may be attached to more. They do not always get along with other breeds. These traits generally make them unsuitable for households with small or boisterous children.

Chihuahuas crave attention, affection and petting. They can be hyper, but eager to please. They have a reputation as a "yippy" dog, which can be resolved with proper training. Chihuahuas with proper breeding are not "yippy"; the AKC standard calls for "a terrier-like attitude." Long haired chihuahuas tend to have a more mellow temperament.

In southern California in 2009, three chihuahuas protected their master, a three year old girl, from a 100 pound mountain lion

The two basic body types of purebred Chihuahuas are Apple headed or Deer headed. Characteristics of an Apple headed Chihuahua are short noses, an apple shaped head, and close- set eyes. On the other hand, Deer headed Chihuahuas have an elongated nose that resembles a Doberman Pinscher's; not shaped like an apple.