Reverse Werewolf

Unlike a werewolf which is a cursed human who becomes a wolf during full moon, a reverse werewolf is originally a normal wolf, but is cursed to turn into a human during the full moon night and return to their wolf form during the day. Just as werewolves lose their human mind and becomes savage in their beast form howling and growling, a reverse werewolf is intelligent, civilized and capable of human speech in their human form.

The white wolf in the woods just transformed into a human during full moon. It must be a reverse werewolf.