I don’t think the original werewolf in 13 Ghosts of Scooby Doo had a tail, but in the recap at the beginning of the direct to video sequel “Scooby Doo and the Curse of the 13th Ghost” a silhouette of werewolf Daphne chasing Scooby, Shaggy and (ugh) Flim-Flam shows her with a tail, so why not?