Meet the Chihuahua dog, world’s smallest breed of dog. With a Hollywood movie and one of celebrity’s favorite toy dog, it’s one of the most popular and sought after dog. This toy dog is often noted for its big apple domed skull, pointed ears and large expressive (often very moist) eyes. Did you know that they have the largest brain on any dog, relative to it’s size. Chihuahuas can live up to 20 years that’s why they require a long-term commitment. I hope you enjoy this best (and cutest) Chihuahua wallpapers we collect.