Warg

Wargs or vargrs are animals found in Norse mythology.

Description
Wargs are an evil breed of enormous wolves that live beyond the world of mortals. Most prominent wargs are Fenrir who is destined to kill Odin, Sköll who chases the sun during the day and Hati, who in turn chases the moon. They are both to eat their prey during Ragnarök, the apocalypse of Norse mythology. These greater wargs are able to talk in human language and are otherwise intelligent.

There are also lesser wargs that nonetheless overshadow the common wolf. Some of these lesser wargs serve as steeds for various jötnar and aesir. While more cunning than ordinary wolves, nothing indicates that a lesser warg shares the ability to speak with their greater brethren. However, they their actions indicate a high degree of intelligent malevolence.

Popular Culture
Monstrous wolf myths are common, and have made their way into many works of fiction.
 * J. R. R. Tolkien included them as steeds for his orcs.
 * George R. R. Martin has his own iteration of wargs in the form of skinchangers who can control the mind of a wolf.
 * Many game systems and digital games have adopted wargs as a typical monster.