Huge, black wolves are aggressive level 8 mobiles found in various places around Arda. Their corpses can be butchered to produce a black wolf fur and some meat.

A huge, black wolf is here, ready to devour.
>examine wolf
Large, even by the standards of black wolves, this beast is a true killer,
afraid of no one. As large as some wargs, its howl strikes terror into even
the most hardened elf or orc. Forever hungry, the wolf attacks mercilessly.