These dogs are known for being small, mighty, and sometimes bitey! They are a Mexican breed of dog, known for having a short stature, big ears, and a bark that is fierce. The Chihuahua holds the distinction of being the world’s smallest dog weighing in between 1 to 6 pounds. They are a good fit in any size home and will get plenty of exercise because they can’t stay still very long. These cute little pups have two types of coats: long and short. Keep in mind that these little dogs are not only known for their bark, but also their bite.