History...

Chihuahuas were originally thought to be descendants of an ancient, similar, but slightly larger breed associated with royalty in Aztec civilizations known as the Techichi. However, due to the lack of archaeological remains it is now believed that Chihuahuas were brought to Mexico by Spanish settlers.

The most current theory holds that Spanish merchants brought Chihuahuas to Spain by way of their trade routes with China and from there to Mexico. The well documented practice in China of dwarfing both plants and animals is the basis for the theory that Chihuahuas originated there.

Another theory is that they originated in Egypt and were traded into Spain and later Mexico.

Chihuahuas were first taken into the United States by American visitors to Mexico.