The pit bull
A pit bull is a fearless dog that will take on any opponent. They will lock their jaws onto the prey until it's dead. Pit bulls have a reputation of mauling people to death and they are highly sought for dog fighting.
Weight: 55-65 lbs.
Origin: United States
Dogs most often make wonderful pets, however in certain circumstances, any type of dog can be dangerous. Even friendly dogs, can inflict great harm in the wrong circumstance.
edit: screw those people who gave me thumbs down, only because I´ve answered it first with a good answer. I know because the dog its seriously crazy, I had one and and died on a fight with other pitbull. and my friend has another.
and there was a fight in youtube where the pitbull almost killed a rottweiler...
My friend owns one... dont forget best answer