Werewolves are fictional creatures, so they don't have any real-life related species.
However, the idea of a werewolf is likely inspired by real-life animals and human beliefs:
Wolves: The most obvious connection is to wolves themselves. Their predatory nature, pack behavior, and sometimes aggressive nature likely contributed to the werewolf myth.
Lycanthropy: This is the term for turning into a werewolf. The word comes from Greek roots meaning "wolf" and "shape." In ancient cultures, lycanthropy was often seen as a real affliction.
Other shapeshifting creatures: Myths from various cultures feature creatures that change form, such as the Japanese kitsune and the Native American skinwalker. These stories may have influenced the werewolf concept.
While werewolves are not real, they are a fascinating reflection of human fears and fascination with the natural world.