Wolves

Wolves were four-legged, carnivorous canines who lived in Arda since the First Age. There were many subspecies in Middle-earth - apart from the original Gray Wolves, these groups included the White Wolves, Dogs, Werewolves, and Wargs.
Dogs were domesticated from Gray Wolves. Werewolves were bred from Gray Wolves inhabited by demons and were minions of the Dark Powers.
[citation needed] . Wargs were a large, intelligent race of wolves who were the natural allies of the Dark Powers, and were most likely descendants of the Werewolves. The White Wolves were a mysterious race of unknown origin who inhabited the frozen Northern lands and might have been neutral.
Wolves, like many other animals in Arda (Crows, Bats, burden beasts, Mumakil, etc.) had nothing to do naturally with forces of darkness but served it at varying points throughout the Ages. Carcharoth, Draugluin, and the other evil wolves of the First Age were normal wolves possessed by Morgoth's power, and the Wargs may have been descended from them.
Because of their strange relationship with the Dark Powers, It is unknown whether wolves were created just as the other Middle-earth beasts were created, or if they were created by Morgoth. If they were created by Morgoth, they were probably the least evil of his creations. During the First Age, the only known time they fought for Morgoth was During the War of Wrath, in which most of the wolves were slain, but a few survived and fled to safety. During the third age, the wolves that lived in Angmar pledged loyalty to The Witch-king. It is also unknown if they chose to join the armies of Angmar, or if they were forced to against their will. They fought in many battles against Arnor and presumably continued to thrive in Angmar after its final defeat.