38 Dog Breeds That Require Extra Caution and Understanding

35. Chihuahua

Chihuahuas are small dogs that can be lively and loud. The AKC notes they are also known for loyalty, politeness, and generosity. Chihuahuas have a "terrier temperament," meaning they are smart but may confuse puppy play with adult behavior. Even if they fit in a purse, they can be noisy. Consistent discipline is needed for the best results with these tiny dogs.