The Chihuahua dog breed is native to Mexico as evidenced by archaeological artifacts, remains and contemporary visual and written depictions. The breed is named after the state of Chihuahua in northern Mexico.
Chihuahuas are descended from a slightly larger breed called the Techichi. The Techichi was developed by the Toltec civilization before the ninth century, perhaps even as far back as 300 BCE, based on pottery depictions. The Aztec, a later cultural group, used dogs similar to the Techichi and Chihuahua for food and religious sacrifice. The dividing line between the Techichi and the modern Chihuahua is unclear. The earliest remains of dogs resembling the modern breed date from 1530. The tiny size of the modern Chihuahua may be due to European settlers introducing the Chinese Crested into the Chihuahua breeding line.