Doppelgangrel

Doppelgangrels are creatures native to planet Fenris in Warhammer 40,000. They are fox-like creatures that are amazingly sneaky, vicious, and cunning, with unnaturally great camouflaging abilities. Lukas the Trickster was one of very few who were able to realize one was nearby and kill them, and he proceeded to use it's pelt as a cloak.