J.R.R TOLKIEN'S LEGENDARIUM

Wargs are canine beasts of Middle-earth in the Misty Mountains, used especially by Orcs of Isengard and Mordor in the Third Age.

 

Wargs are described as having a sort of leader or chieftain, as speaking their own language (which Gandalf understood), and as sometimes joining with Goblins (Orcs) on their raids. To their mutual benefit, Wargs would allow Orcs (who sometimes rode on wolves like men do on horses) to use them as mounts during raids on villages lying near the mountains.