What Is Dog Fighting?

The crowd's roar dulled to a hum as the next two fighters appeared. The previous match had been short, as one contestant quickly outmatched his opponent, mauling him badly and tearing off an ear. But this final fight matched two skilled and highly respected combatants. They eyed each other eagerly from across the pit, muscles tensed in anticipation. Spectators came to the edge of their seats. Fathers lifted children to their shoulders for a better view as the referee stepped to the center, called the dogs to their scratch lines and yelled, "Let go!" A cheer arose as the dogs charged across the pit and slammed into each other, teeth flashing as they sought a vulnerable target. After half an hour of fighting, the brindle looked beaten. Wounded and panting, he turned away from his opponent. The referee called the turn, and, when neither dog had a hold on the other, the handlers picked them up. The dogs were returned to their scratch lines and held. Both were breathing hard and bleeding from their bite wounds. Because he made the turn, the brindle would be released first. If he failed to attack now, he would lose. "Let go," the judge called again. The brindle was exhausted and badly hurt—but he was a game dog. Responding to an impulse bred into him over generations and nurtured through training, he stumbled across his scratch line toward his opponent. The other dog’s handler released him with the encouragement, "Finish him off, Bo." Bo knocked the brindle to the ground, seeking a hold on his throat. Though getting the worst of the fight, the brindle managed to grab Bo’s right front leg in his powerful jaws. As he bit down hard and twisted, the snap of breaking bone was heard. Bo lurched backward and then turned away from the brindle. Now it was Bo’s turn to scratch. Barely able to stand in his corner, the brindle strained against his handler’s arms, eager to continue the fight. But when he was released, Bo would not cross the pit. The referee called, “One…. Two… Time!” The crowd cheered for the brindle. He would die from his injuries an hour later, but he had won his fight. Bo’s handler spit on the ground. He had a lot of money on this match. Muttering, “Worthless cur,” he dragged Bo out of the barn and toward his truck, where a shotgun waited.
 http://www.aspca.org/fight-animal-cruelty/dog-fighting/history-of-dog-fighting.aspx

History of Dog Fighting
Dog fighting has been a common sport in America for a long time. Fights like the one above could happen anywhere, at any time, with any people.

About the Dogs
Certain dogs are bred to do certain things. Take a border collie, for example. Bred to herd, and herding will always be in their blood, it's their instinct.

http://www.thekennelclub.org.uk/download/6002/BCHT_dog_running_past_sheep.jpg

And its the same for fighting dogs. A fight between two puppies will be over quickly as soon as one submite to the other's dominance

http://26.media.tumblr.com/tumblr_l92jfjlp6l1qzegudo1_500.jpg

And there are seldom injuries.
But fighting dogs are dogs that have been genetically engineered and changed so that in a fight, they don't back down when the other dog submits. They are bred to continue fighting, even if they are injured.

But its important to realize that not all pitbulls and other fighting dogs, fight.

http://www.modcloth.com/store/images/Cute_Pitbull.jpg

http://canisbonus.com/wp-content/uploads/2010/07/pitbull.jpg

Although a lot of them do, some don't.