I just remember a glimpse from around 40 years ago. The story may be older.
An exploration space ship from Terra is landing on an alien planet. The Earthlings are coming in contact with the alien cat-like inhabitants. The natives seem to be peaceful. But some crew men are vanishing and no one knows why.
Just two mechanics know more. They have seen the alien creatures turning wild at night and killing the Terrans. But they have no fear. In contrary they are happy. They think that they have found the perfect place.
They are werewolves, the born superior enemies of cats in search for a place for their race. They are hungry for fight and heating up the hostility by clandestine killing the cat people.