Meet Hulk: he is a 175-pound American bulldog and American pit bull terrier mix who made headlines earlier this year because of his enormous size. Hulk lives in White Mountains, New Hampshire with his owners Marlon and Lisa Grennan. He just had eight puppies! The Grennans own a training school on a 15-acre, $1.5 million estate. They’re known for breeding and training American pit bull terriers. If trained at their school, each of the eight pups could cost up to $55,000. Marlon Grennan, 28, told the Daily Mail: “This is definitely one of the most valuable litters we have had. If the litter were all trained as protection dogs they could be worth in excess of half-a-million dollars.” The Grennans say that Hulk is so well-trained that they even let their 3-year-old son interact with him. Their goal is to show the world that when pit bulls are gentle and balanced, they can be the greatest dogs in the world. The Grennans’ breeding of Hulk has also been met with a lot of scrutiny.

According to the United Kennel Club, there can be serious issues with breeding American pit bull terriers this large: “Excessively large or overly massive dogs and dogs with a height and/or weight so far from what is desired as to compromise health, structure, movement and physical ability.” According to Bancroft TV, all the puppies were sold before they were even born. Check out Hulk and his new puppies in action: Videographer / Director: Ruaridh ConnellanProducer: John Balson, Chloe BrowneEditor: Joshua Douglas, Sonia Estal, Ian Phillips Family affair: Marlon Grennan, 28, with wife Lisa, 25, son Jordan, three, and giant pitbull Hulk and his newborn puppies The eight puppies were fathered by gentle giant Hulk, who weighs in at a huge 12 stone. And even though his owners say his bite could 'snap a man's arm like a toothpick', here he shows off his softer side by nuzzling and licking his new brood. Top dog: Twelve stone Hulk gets to grips with his latest litter of puppies - which could be worth up to $500,000

The eight pups could collectively command $500,000 (£320,000) if they go through owner Marlon Grennan’s training school to become elite protection dogs. And there are even hopes one of the new batch could one day grow big enough to steal their father's crown. Handle with care: Jordan Grennan, three, holds two of Hulk's newborn puppies Marlon, 28, said: "This is definitely one of the most valuable litters we have had. If the litter were all trained as protection dogs they could be worth in excess of half-a-million dollars, absolutely. "In about five to seven weeks we'll start to see them separate out and get a good idea of just how big they will get. Puppy love: Hulk, the world's most famous pitbull, relaxes beside his new brood in New Hampshire, USA "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. "Most of them are already sold. That's just how well thought of Hulk's bloodline is thought of."

Hulk's puppies would usually sell for up to $30,000 (£19,000) at birth, simply because who their father is. But if they were to be trained as elite protection dogs then Marlon says they could sell for $55,000 (£35,000) or more, Marlon says.Vizsla Puppies For Sale In Dorset Foam friends: Hulk and two of his nine-week-old puppies enjoy some bathtime with best friend, JordanToy Labradoodle Puppies For Sale In Iowa 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.Kohler Faucet Stem Removal 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. Controlled: Marlon and Lisa say their son is 100 per cent safe handling the supersized pitbull 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. New parent: Fatherhood is clearly tiring out Hulk as he takes a yawn beside the eight puppies "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. "We are professionals and we live this everyday.

Our son is very safe around these dogs and what we do. "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." Lick father lick son: Hulk relaxes in the bathroom with Jordan and dad Marlon While in the past Marlon has been offered thousands of dollars to sell Hulk he has declined because the dog is part of the family. He said: "Hulk has shown the world that when this breed is gentle and balanced, they can be the greatest dogs in the world. "I love this dog so much I honestly can't even put it into words. There are no words to describe it."Search and see photos of adoptable pets in the Leesburg, Florida area Our Featured Leesburg, FL Partner:Bully MarketYou've seen a lot of Bogart lately and it's easy to see he's a Buss son but those good looks are coming from moms side too. Bully Market with Potter Jones and 2 others.Beastro and Phoenix, do you need anything else?

Bully MarketHappy National Dog Day! Bully MarketNothing can stop Bogart. He's all the way up! Bully Market with and 2 others.Bully Market with Robert Lee and 6 others.Bogart doesn't know how to play Pokemon-Go but he does know how to "level-up". Bully Market with .Bully MarketWho wants to play? Posted by Bully Market with Roland Elarco.Who can appreciate all the females we have been posting? Say hello to Jelly Bean, a Buss daughter. Bully Market shared their video.One of the most well rounded bullies on earth!Posted by Bully Market at Horseman and Dog Fanciers Park.Las Vegas, NVGrCh Thee Buss isn't just a beast in his photographs and conformation shows. He also has the drive to chase the lure and run the agility course. You won't find many pocket bullies with his stature, drive and stamina. He's truly one of a kind! Bully Market with Eliana Ledesma.One of our Beastro daughters, the beautiful Honey B 🐝. wBully Market with Robert Lee and 4 others.Is it too late to get these boys in the Summer Olympics for track and field? w