3. Rottweiler
Rottweilers were initially bred for cart pulling and home protection. This breed is known for its intensity and was among the first livestock herding breeds. Many consider Rottweilers to be intelligent and active, requiring significant attention and exercise. Without these, they may become aggressive. Aggression can escalate to biting or attacking. The Association of Professional Dog Trainers estimates that a Rottweiler can bite with a force of 328 psi—nearly 2.5 times stronger than the average human.