Wargs, the canine monsters that Orcs rode into battle, were some of Middle-earth's most memorable creatures. They have appeared prominently in nearly every adaptation of J. R. R. Tolkien's work, including The Lord of the Rings and The Hobbit film trilogies as well as The Lord of the Rings: The Rings of Power. However, such adaptations rarely offered clear explanations as to what exactly Wargs were or where they came from.
Source：https://www.cbr.com/lord-of-the-rings-wargs-explained/
