 Archaeological evidence has been found in the tombs of the Colima, Mayan, Toltec, Zapotec, and Aztec Indians 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.