Use the Felhound Whistle to summon a Fel Guard Hound. Take the Fel Guard Hound for a walk and kill some Deranged Helboars. Search for the Shredder Keys in the Fel Guard Hound's "leavings." Return the Shredder Keys to Foreman Razelcraz by the mine northwest of Thrallmar.
I finally got my shredder working but I seem to have lost the keys. I keep a pack of felhounds to protect my camp. They don't do a very good job and they like to bite me a lot. They also like shiny things. I think this one felhound I have may have eaten my shredder keys. I'll pay you if you'll take my felhound on a walk. Kill some helboars and let him eat. He'll do his business. When he's done, see if you can't find the keys in his "leavings."
You smell terrible. But you found my keys! Thank you so much. Now I can get my shredder started and make some money. Pretty soon I will have enough money to leave Outland. I don't know why you stay; I hate this place. Wouldn't you rather be back in Booty Bay?