This pint-sized pet is master of his universe and fears nothing, characteristics that make him a most suitable pet for some people and the worst possible choice for others. Demand has increased with the sudden spurt of popularity as the Taco Bell dog which has brought notoriety and demand for the tough and intelligent dogs. They are prized for their devotion, ferocity, and personality. Chihuahuas are not well-suited as small children's pets because of their size, temperament, and tendency to bite when frightened. It is recommended that children be school aged or older before adding a Chihuahua to one's home.