Tiny Chabella, descended from a breed the Aztecs considered sacred, represented the Xoloitzcuintli (which means "hairless dog" or more broadly "dog of the god Xolotl") for the first time at the show.
Xolotl was the Aztecs' god of lightning and death; the xolo's name makes reference to him because Aztecs believed the dog's mission was to accompany dead people on their journey to the afterworld, Chabella's owner Stephanie Mazzarella told AFP.
Scholars apparently thought the Spanish accounts couldn’t be trusted and suggested the animals referred to as “little dogs” were more likely opossums. Yet a similar custom of elites eating fattened dogs was common in Mexico. The breed usually eaten was the Techichi which was a mute dog that the modern Chihuahua is thought to be derived from. The dog pots in Colima in west Mexico show fattened Techichis which provide visual evidence for this practice. The dog pots in the southeastern U.S. show fattened Chihuahuas which suggest this tradition was also practiced in the southeast. Thus it is likely the early Spanish eyewitness accounts were accurate descriptions of Native American traditions in the region.
Since neither article mentions the breeds in the other, I'm not sure if the Xolo and Techichi breeds are related. They look like they could be.
For more on Native dogs, see Is "Indian Dog" a Breed? and A History of Indian Dogs.
Below: "Armani, a Xoloitzcuintli, at the Westminster dog show." (Mike Segar, Reuters, Agence France-Presse)