Dude,
Xolotl was the dog teotl (god) who was associated with Nanahuat(zin) and the nahualli of Ehecatl Quetzalcoatl. He was renowned for retrieving maize from The Mountain of Sustance. Nanahuatzin threw himself into a sacred pyre and became Tonatiuh (the sun). Xolotl was sacrificed last by Quetzalcoatl because he fled and turned himself into his nahualli the axolotl. Dogs and axolotls were considered a source of food so he represents the sacrifice necessary to eat, also the planet/star Venus in the evening.
I don’t know what aspect of Mixtec Pueblo mythology you’re referring to.
Try model painting.