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

3. Rottweiler

Rottweilers were first bred for pulling carts and guarding homes. This breed is known for its intensity. They were among the first livestock herding breeds. Many consider Rottweilers smart and active, needing lots of attention and exercise. Without these, Rottweilers can become aggressive. Aggression can quickly lead to biting, attacking, or scratching. The Association of Professional Dog Trainers estimates a Rottweiler can bite with a force of 328 psi—almost 2.5 times stronger than the average human.