"In Aztec mythology, Xolotl (Nahuatl pronunciation: [ˈʃolot͡ɬ] was a god associated with both lightning and death. He was also associated with the sunset and would guard the Sun as it traveled through the underworld every night. Dogs were associated with Xolotl. This deity and a dog were believed to lead the soul on its journey to the underworld.[1] He was commonly depicted as a monstrous dog. Xolotl was the god of fire and lightning.[2] He was also god of twins, monsters, misfortune, sickness, and deformities. Xolotl is the canine brother and twin of Quetzalcoatl,[3] the pair being sons of the virgin Coatlicue. He is the dark personification of Venus, the evening star, and was associated with heavenly fire.

[....] Xolotl is thus a master transformer."

Source: https://en.wikipedia.org/wiki/Xolotl