35. Chihuahua
Chihuahuas are small dogs that can be lively and loud. The AKC notes they are also known for their loyalty, politeness, and generosity. Chihuahuas possess a “terrier temperament,” meaning they are intelligent but may confuse playful behavior with adult conduct. Even if they fit into a purse, they can be noisy. Strict discipline is essential for achieving the best results with these tiny dogs.