For some unknown reason, the werewolves were left without a tail, but in the previous parts it was =)
A druid is not a worgen so he doesn’t have a tail 
Please return the tail to the werewolves or take the tails from the druids in World of Warcraft (don’t you dare, it’s a joke!) =)
= Here were proof link from Diablo 2: LoD and Diablo 2: Resurrected, werewolfs with tail, but I cannot use links. But who needs these proofs? Everyone already remembers that the werewolf druid has a tail, it cannot be otherwise;) =