Chihuahua
Chihuahuas look pretty innocent. They’re one of the smallest dog breeds, so you would think that they’re also one of the safest. The thing is because Chihuahuas are small, they have to be super stubborn and aggressive to protect themselves from bigger animals. While you can train a chihuahua to respect people if you’re not firm enough they can turn on you and even attack small children who provoke them. They also tend to get jealous of small kids.