Wargs appeared in two different breeds, common wargs and true wargs.
- Common Wargs were just an extremely large breed of war-wolves, bred by Morgoth from ordinary wolves in the first age. The Mountain Wargs or Grey Wargs were of this kind, the Frost-Wargs of the Forodwaith were bred by the Ice-Orcs by interbreeding Wargs with White Wolves. The Isenwargs or War-Wargs were a breed created by Saruman of common Wargs and wild eastern Beasts.
- True Wargs or Ghost-Wolves (Also known as Black Wargs, Shadow-Wargs, Dire-Wargs, Fell Wargs, Shadowmaws, Warg-Wights or Deg-lic) were lesser Were-Wolves, undead spirits incorporating the bodies of degenerated and magically altered great wolves. Being artificially long-lived, undead, the spirit that inhabited a true Warg's form dissipated when the body was slain. In turn, the body disappeared.
The Wargs might correspond to the "megafaunal wolf" or "cave wolf".
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