Press F2 to bring up the cheat window. Type in the following cheats, then

press F2 again.

dh4superActivate all cheats
dh4nofear Animals unafraid of you 
dh4find Brings you to the nearst deer    
dh4beacon Irresistible to animals 
dh4sightinGun sights
dh4beacon Irresistible to animals 
dh4leadeyeBullet view
dh4monsterGiant deer
dh4homegymNever tire
dh4plague No animals
dh4beacon Irresistible to animals 
dh4playthedemon Demon deer!
dh4ice Snow
dh4waterRain

dh4thorThunder

dh4zeusLightning

dh4dry Clear weather

Thanks to Revolution readers Zac, Martin K, and Paul!