Ferocious wargs are aggressive level ~11-12 mobs found mostly in the eastern parts of Arda. They can track. Their corpses can be butchered to produce a warg fur.

A ferocious warg is here, snarling angrily.> look wargThis is an exceptionally large wolf of thick black fur. Saliva drips from thegreat fangs and the eyes reveal an evil intelligence. Allied with the orcs,this creature of Morgoth's devising is the bane of the free people of the west.