Brutus, an 800 pounds grizzly bear, is Casey Anderson’s best friend.Click to see full answer. Consequently, how big is Brutus the bear?But naturalist Casey Anderson has taken that a step further and adopted an 58-stone grizzly bear called Brutus, who he has raised since birth.Secondly, how old is Brutus the grizzly bear? 13 years old Regarding this, who owns Brutus the bear? Casey Anderson (naturalist) Casey Anderson Born East Helena, Montana Alma mater Montana State University Spouse(s) Missi Pyle ( m. 2008; div. 2012) Stephanie Gazda ( m. 2016) Career Can a grizzly bear be tamed?They can’t be tamed. The bear appears tame, and they can be trained and will become used to people. However, handlers usually only work with the bear after it’s had a large meal, and they are constantly on their guard.