From Wiki4Games

[edit] Cheat codes

Fast Grizzly: For an added challenge, push simultaneously F1, F2, F3, F4. You will now have superfast grizzlies.

Reveal Bear: While playing, type "ghbear". An arrow will show you where the bear are.

Zombie Bears: To turn your bears into zombies, here's what you do. First, kill a bear. Then, throw the bait near the bear and release the dog.

Undead bear: Kill a bear, then throw bait near the carcass and release the dog.

Hunt larger bears: To hunt larger bears,push the tilde key [~] and type "tom"