This article is from the Chihuahua Breed FAQ, by firstname.lastname@example.org (Melinda 'Bob' Casino) with numerous contributions by others.
Carvings found in the Monastery of Huejotzingo, on the highway from
Mexico City to Puebla, give strong evidence as to the Chihuahua's
origins. This monastery was constructed by Franciscan Monks around
1530. The Monks used stones from the Toltec civilization. Little is
known of the Toltecs, but we do know that they existed as early as the
9th century A.D. in what is now Mexico. The Toltecs had a breed of dog
they called the "Techichi". And the carvings on the stones at
Huejotzingo give a full head view and a picture of an entire dog that
closely resembles the modern-day Chihuahua. From this evidence, we can
safely assume that the Chihuahua is a descendant of the Techichi.
Additionally, there are remains at some pyramids and other pointers
to the early existence of the Techichi at Chichen Itza in Yucatan.
The Techichi was a religious necessity among the ancient Toltec
tribes and later among the Aztecs. Archaeologists have found the
remains of this breed in human graves in Mexico and in parts of the
For more information about the religious and mythical role of the
Techichi in Toltec tribes, I recommend The American Kennnel Club's
Official Breed Book (see Books).
The first Chihuahua to be officially registered by the American
Kennel Club was "Midget" in 1904.