Tail is Hida. And I agree that it should be tagged as anthro, I always tag my WoW pandaren, tauren and worgen as anthro because they're still furred characters with focuses on the furred portion more than the human portion of their biology.
Actually your point about the Worgen is wrong. A worgen is actually more human than furred, the human is in control no matter which form the Gilnean decides to take.