World's Largest Pitbull Fathers Eight Pups Worth Up To Half A Million Dollars (Pics & Video)

Hulk, who made international headlines when he was unveiled earlier this year, has also been in training to become a protection dog at Dark Dynasty K9s in New Hampshire, USA. The business supplies protection dogs to high-profile celebrities, billionaires and wealthy professionals - as well as law enforcement around the world. He has so far been taught to attack and release on command as well as vault and assault would-be assailants in and on cars.