Wolves

"Wolves should come and slow devour them one by one...."

- On Beren and his Elven companions' fate at the hands of Sauron's wolves Wolves are beasts of the wild who are sometimes used by Sauron, the secondary antagonist of Beren and Lúthien.

Beren and Lúthien (Silmarilion)
"...hunting Orc and wolf a-prowl..."

- On Beren hunting agents of Sauron Wolves are reffered to as being creatures of the wilderness, though even if they are wild they are most often in the service of Sauron the dark lord of Tol-In Gaurhoth. Werewolves are descended from wolves, bred by the Enemy and sometimes Morgoth to serve them.