Whistling In The Dark

What's wrong with space werewolves? I mean, depending on what traits you are assigning them, the universe might be a bit small or a bit young to expect them to have had time to come about, but nothing we know about life specifically rules out a critter that fits the werewolf description somewhere out there. Admittedly, a proper werewolf would be much easier to engineer than evolve, and if the shape change is dramatic, they are going to have huge food bills, but they aren't impossible. Of course, if you traits like "able to infect humans with lycanthropy, the universe is still a bit young for that one to come about naturally, and if you want them to visit, you're going to need a hell of a cheap energy society (which would probably be able to engineer werewolves to any specifications that kept to the rules of thermodynamics.