3. Rottweiler

Strong dogs known as Rottweilers were once bred to pull carts and protect houses. This particular breed of dog is known for its viciousness. One of the earliest breeds of farm animals employed for herding were these dogs. The species is thought by many to be intelligent, active, and demanding of a lot of attention and exercise. Without these things, Rottweilers may become aggressive. Aggression may easily escalate into destructive actions like biting, charging, or scratching. The Association of Professional Dog Trainers (APDT) estimates that a Rottweiler can bite with 328 psi (pounds per square inch) of force. This is almost 2.5 times the human psi, which ranges between 120 and 140 on average.