Deviantart link but I originally stumbled across this by accident over on Know Your Meme for some reason.

Artist's commentary:

....the title speaks for itself

Have a SPOOPY Halloween!

This was posted Oct 30, 2013, which means this it was drawn in the olden times during Volume 1.

I've not seen Weiss be a wolf faunus before, only ever Ruby, tho I have seen a few faunus Weiss fics and art pieces passed around, mostly bird faunus which I suspect was due to the popularity of fics like Craving the Sky.