Although the history of Chihuahuas is not absolutely certain, there are many theories about the origination of the breed.
Pretty much all theories show that they descend from Mexico. The most common theory is that they descended from the “Techihi,” a domesticated companion of the Toltec Civilization. Paintings of Techihi date back to 300 B.C. on pots buried in tombs. However, actual records only date back to the 9th century.
It is believed that the Techihi breed was around when the Mayans were. It is also believed that the Aztecs domesticated these dogs and used them in religious ceremonies. They were usually only owned by the wealthy citizens.