Felhound Poo
From WoWWiki
Felhound Poo is the poo from Felhounds. It appears every time your felhound (from using [Felhound Whistle]) eats Hellboars that you just recently killed while in Hellfire Peninsula.
Objective of
It might contain [Shredder Keys] for the quest 
[61] Shizz Work.
Other contents
When looted you become Stanky.
