A long tail. Ears that stand up and can be moved. Hey, even a vampire is good at body language. Let us get back to wolves. Check out the wolf in the picture below.
Lets take a close look at the picture above.
The wolf on the left has its ears up but it has its tail down. The wolf on the right has its ears back, but they are not pinned to his head. Also, the wolf on the right has its tail down too. I think these two guys are playing. It is hard to tell from a picture alone.