The world's biggest Pitbull is now a father, and his litter could bring his owners a super-sized paycheck! This gentle giant fathered 8 puppies and is really showing his softer side with the pups. "Hulk is a gentle giant and a great father. He will think nothing of laying down and licking his young puppies and is very gentle with them. He is an awesome dad," says his owner Marlon Grennan and wife Lisa.  

Weighing in at 175lbs Hulk's bite is "able to snap a man's arm like a toothpick", according to Marlon.

Hulk made international headlines and is in training to become a protection dog at Dark Dynasty K9s in New Hampshire. This means that one day Hulk could be trained to protect high-profile celebrities, billionaires, as well as law enforcement agents.

In spite of Hulk's ginormous size and his training to take down full-grown men, Marlon and Lisa don't worry about letting their 3 year old son Jordan around the 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," said Marlon.

Hulk's puppies usually sell for up to $30,000 at birth, simply because of who their dad is. If they were trained as an elite protection dog then they could sell for $55,000 or more. The pups collectively could command half a million dollar payday according to Marlon.

"Their papa isn't a legend for no reason but the potential to have another record-breaking world famous dog amongst his puppies is definitely there," said Marlon.

Good luck trying to get your hands on one of these pups though. Most of Hulk's puppies are already sold.