 Warg

In Norse mythology, a vargr (often anglicised as warg) is a wolf, especially the wolf Fenrir and the wolves that chase the sun and moon Sköll and Hati.Based on this, J. R. R. Tolkien in his fiction used the form warg, which may incorporate Old English "wearh", as the name of a particularly large and evil kind of wolf that could be ridden by orcs.