Itzcuintli. The Xoloitzcuintli is a hairless dog from Mesoamerica. Archaeological evidence has been found in the tombs of the Colima, Mayan, Toltec, Zapotec, and Aztec people dating the breed to over 3500 years ago. Long regarded as guardians and protectors, the indigenous peoples believed that the Xolo would safeguard the home from evil spirits as well as intruders. In ancient times the Xolos were often sacrificed and then buried with their owners to act as guide to the soul on its journey to the underworld. These dogs were considered a great delicacy, and were consumed for sacrificial ceremonies-including marriages and funerals. In many versions of the 20-day cycle of the Mesoamerican calendar, the tenth day bears the name dog. Maya burials from the Classic Period are frequently found with associated animal remains, often dogs. For example, in the ruins of the Classic Maya city of Kaminaljuyu in Guatemala, a dog was found interred with a sitting skeleton, along with grave goods offered to the deceased. The frequent finds of dog skeletons in Classic Maya burials confirms that the belief that dogs guided the souls of the departed on their journey into the underworld already existed at this time. The dog is sometimes depicted carrying a torch in the surviving Maya codices, which may be a reference to the Maya tradition that the dog brought fire to mankind. The people who escaped this fate were transformed into monkeys. Another account in the Popol Vuh describes the Hero twins sacrificing a dog that belonged to the Lords of the Underworld, also known as Xibalba. After the dog was dead, the Hero Twins brought it back to life. The Lords were so impressed that they asked the twins to sacrifice and resurrect them. In the end, the Hero Twins sacrificed the Lords of Xibalba and did not follow through on bringing them back to life. This made it possible for humans to live on earth. The story linked dogs with renewal and human life. Dogs are associated with death and have the job of leading people into the Underworld. They represent fire and are protectors of the hearth, two components of Maya life. In Aztec mythology, the Fourth Sun disappeared in a great flood. A man and a woman survived inside a log and were washed up upon a beach, where they promptly built a fire and roasted some fish. The smoke from the fire upset the stars Citlallatonac and Citlalicue, angering the great god Tezcatlipoca. In his fury, he severed their heads and stitched them onto their rears, creating the first dogs. Xolotl from the 15th century Codex Fejervary-Mayer Among the Aztecs, the god Xolotl was a monstrous dog. During the creation of the Fifth Sun, Xolotl was hunted by Death and escaped him by transforming himself first into a sprout of maize, then into maguey leaves and finally as a salamander in a pool of water. The third time that Death found Xolotl, he trapped and killed him. Three important foodstuffs were produced from the body of this mythological dog. Mictlantecuhtli, Lord of the Dead, had the bones of man in the underworld, kept over from the previous creations. Xolotl descended to the underworld to steal these bones so that man could be reborn in the new creation of the Fifth Sun. Xolotl managed to recover the bones and brought man to life by piercing his penis and bleeding upon them. Xolotl was seen as an incarnation of the planet Venus as the Evening Star.