Reference: Dogs among the Aztecs, Tarascans, and Mayans

Similar inscriptions in the surviving Mayan Codices depict the dog as the bringer of fire to the people and, in the Quiche Maya holy book, the Popol Vuh, dogs are instrumental in the destruction of the ungrateful and unknowing race of humans which the gods first produced and then repented of.

The Aztecs and Tarascans shared this view of the dog, including the dog as a guide to the afterlife for the deceased. The Aztecs also had a story in their mythology regarding the destruction of an early race of human beings in which dogs are featured. In this tale, the gods drown the world in a great flood but a man and woman manage to survive by clinging to a log. Once the waters recede, they climb onto dry land and build a fire to dry themselves. The smoke from this fire annoys the great god Tezcatlipoca who tears off their heads and then sews the heads to the rear-ends of the man and woman and, in doing so, creates dogs. According to this myth, dogs pre-date the present race of human beings and so should be treated with respect the way one would treat an elder. The Aztecs also buried dogs with their dead and their god of death, Xolotl, was imagined as a huge dog.

The Tarascans, like the Aztecs and Maya, kept dogs as pets, for hunting, and for food and also linked them with the gods and the afterlife. The souls of those who died without proper burial, such as those who drowned or were lost in battle or died alone on a hunt, were found by spirit dogs who would ensure their safe passage to the afterlife. In all three of these cultures (as, indeed, in the others mentioned above) the belief in ghosts was very real. A ghost could not only make trouble in one's daily life but could actually bring physical harm and even death. The Tarascan tale about the spirit dogs allayed the fear that, if one had not been able to properly bury a loved one, the deceased's ghost would return to trouble the living. The people would not have to fear because the dog would take care of the problem.

Joshua J. Mark, "Dogs in the Ancient World"