Xolos are national treasures in Mexico, with a history that goes back at least 3,000 years. Mentions of these “strange hairless dogs” appear in the journals of Columbus and other European explorers. Ancient Aztecs named the breed for their dog-headed god Xolotl. Xolos were considered sacred by the Aztecs and often were sacrificed and buried alongside their owners to serve as protective guides to the next world. In modern times, Xolos are dedicated to watchdogs and companions.