The Probert Encyclopaedia of Nature

CHIHUAHUA

The Chihuahua is a breed of very small dog, named after the state in Mexico where they were first obtained. The breed probably originated from the ancient Techichi breed kept by the Toltec Indians in the 9th century. The Chihuahua breed was first recognised by the American Kennel Club in 1904, and was a short-haired breed. Further breeding has resulted in long-haired varieties. They dislike cold weather, and are very social but have a short-temper which makes them unsuitable as family pets where there are children. They have an unfused skull which leaves the brain exposed and makes them vulnerable to a blow on the head.
Research Chihuahua