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

But owed to his balanced nature, former boxer Marlon and wife Lisa Grennan, 25, still allow him to interact and even bite-train with their three year old son, Jordan. Outside of training the pair are also best of friends and love bathing and singing together, with Jordan playing the harmonica while Hulk howls. Lisa said: 'Hulk is an awesome, well-balanced dog and he doesn't get phased by the sort of things that might upset or distract another dog. 'Jordan has never been bitten by any of our dogs and I would never put him in a position to have that happen. He is 100 per cent safe when he is working with the dogs.