Verified answer

Fangs are a must for that. To get the angry bit down, I'd paint your faces if I were you, maybe stick some crinkled whiskers in depending on how fancy you want to get...You could probably find some werewolf gloves to suit the part, or just glue on some fake nails. Around Halloween they sell sharp ones, or just buy cheapies and file them to a point (Not too sharp!)

I honestly have no clue what you're going to do about the tail, but for clothes, turning a brown sweatshirt inside out will make you fuzzy. If it were me, I'd go all out and turn some brown sweats inside out too, and cut them up and sew them together again, maybe even with some darker colors in there to make it look more like a costume, instead of just inside out sweats :]

Good luck!

Evil Squirrel Gif

Get vampire fangs, clawed cloves to start out.