Anderson 33, hand-reared Brutus from a cub after he was born into captivity and faced euthanasia because he couldn’t be released into the wild.
The pair have become so close that the seven-foot eight inch grizzly bear was best man at his wedding to the 36-year-old actress.
Brutus, who weighs 900lbs (0.45 tonnes), stole the show at the marriage in Swan Valley, Montana, where he ate the wedding cake in front of 85 guests.
Naturalist Casey, who lives in Montana, America, even admitted he even owed his “best friend” Brutus for introducing him to his future wife.
He said: “When Brutus was born, it was a dead end street because he couldn’t be released into the wild so had to remain in captivity or be euthanased.
“So I came up with the idea to rescue him and build a home to save other grizzly bears and since then he’s completely changed my life.
“I take him for long walks. I swim with him and I’ve even started teaching him how to fish. I feel like his father in a way – but in reality I’m more of his friend.
“Now I owe him for introducing me to my wife and he was best man at my wedding – he really has changed my life.
“With other bears he plays rough but I’m not scared of him because when I wrestle him he knows he needs to be a lot more gentle.
“He doesn’t want to hurt the people that he loves and I think he does love me after all the years and time we have spent together. He’s my best friend.”
Brutus was born in 2002 at a rescue centre in Idaho, America, where he was at risk of being put down because he could not be released into the wild.
However, Casey, who worked at the centre, decided to look after him and set up the Montana Grizzly Encounter, near Yellowstone National Park, America.
Grizzly bears are renowned for being extremely dangerous but after spending the last seven years together the pair have forged a close and trusting relationship.
Casey and Brutus often eat, walk, swim and wrestle together, relax in the jacuzzi and always celebrate their birthdays and Thanksgiving Day by eating a meal in his house.
Brutus was best man when Casey wedded actress Missi, who starred in ‘Charlie and the Chocolate Factory’ and ‘Harold and Kumar Escape from Guantanamo Bay’.
The couple met on the set of the film ‘Pretty Ugly People’, in which Missi and Brutus co-starred.
Missi explained: “Casey runs a grizzly sanctuary; Brutus was in the movie. We wanted Brutus as the ring bearer but the game-and-wildlife people wouldn’t let us.”
Because Brutus was removed from his father at a very young age Casey is now teaching the grizzly bear how to catch fish.
Casey added: “Brutus engages with humans in a way that other bears don’t because he is very intelligent and emotional. His personality is very gentle.
“He a very close friend of mine and I believe that he is much more intelligent and emotional than a dog.
“He understands exactly how I’m feeling for example when I am sad he’s very sympathetic and even gentler towards me.
“To see these characteristics in an animal is an amazing thing and I think it’s important to educate people about grizzly bears.
“We’re trying to cure the myths, educate the public. There’s a way to coexist with these animals as long as you play by the rules.” Source