Have you ever had an animal at home?
I have a husky as well, I have been bitten a few times, not because he is a bad dog, but just playing around that got a bit out of hand.
My dogs teeth pierced through my skin fast, he realized what he did wrong and stopped playing. My arm swelled up instantly as well.
I can only imagine a bigger version of that would be devastating.
You can swing and punch, and try to cave its head in, but the truth is, one missed move, one split second, and its got its jaws around your arm or neck. Your first reaction will not be to keep hitting it. IT wont be to shoot it, itll be to try and get out of its jaws.