38 World's Most Dangerous Dog Breeds You Must Be Aware Of

35. Chihuahua

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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. Strict discipline is needed for the best results with these tiny dogs.