The Chihuahua breed is a popular choice if you're looking for a toy-size breed. While they might be small in size, they are big in personality and aren't afraid to let you know just how they feel.

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images The Chihuahua breed is a popular choice if you're looking for a toy-size ...

Some massive breeds such as the St. Bernard completely lack wolf DNA, but the tiny Chihuahua retains detectable wolf ancestry ...