The smallest breed of dog in the world is the Chihuahua. Originating from Mexico, Chihuahuas are known for their tiny size, with some weighing as little as 2 pounds and standing just a few inches tall. Despite their small stature, these dogs are often full of personality, exhibiting a fierce loyalty to their owners. They can be found in a variety of colors and coat types, including both short and long hair. Chihuahuas are popular companion animals and often form strong bonds with their human families, making them a lively addition to many households.