While you probably know exceptions to the breeds on this list, some dogs are more dangerous simply based on their size and force of their jaws.

Dogs have long been known as man’s (and woman’s) best friend. Canines are loyal and lovable, and they often provide comfort, protection and other services to their human counterparts. However, they can also be dangerous.

Depending on the animal’s upbringing, temperament and circumstances, any dog can be a threat. Even small dogs might bite someone. In fact, chihuahuas sink their teeth into vets more often than any other type of pooch.

But certain breeds can cause greater harm simply because of their size or the force of their jaws. Based on the damage they can do, these are some of the world’s most perilous pooches, in no particular order.

3Bull Terrier

SONY DSC

Depending on your age, these pups might make you think of either Spuds MacKenzie or Bullseye, the Target dog. Bull terriers are affectionate pets that love to have fun. Although the unique-looking dogs are not especially large, they are quite muscular and were originally bred to be champion dog fighters. Because of their strength and strong prey drive, they should be watched around children and other animals.