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

dh4super		Activate all cheats
dh4nofear 		Animals unafraid of you 
dh4find 		Brings you to the nearst deer    
dh4beacon 		Irresistible to animals 
dh4sightin		Gun sights
dh4beacon 		Irresistible to animals 
dh4leadeye		Bullet view
dh4monster		Giant deer
dh4homegym		Never tire
dh4plague 		No animals
dh4beacon 		Irresistible to animals 
dh4playthedemon Demon deer!
dh4ice 			Snow
dh4water		Rain
dh4thor			Thunder
dh4zeus			Lightning
dh4dry	 		Clear weather

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