A Chihuahua is the smallest dog. It has big eyes and big ears. It is small enough to fit in a very small purse. This dog came from Mexico. The baby Chihuahua is called a welp, puppy, and pup. A Chihuahua can live up to 16 years. A chihauhua doesn’t do good in the cold weather because it’s very small. Chihuahuas chew things like paper.