Angry Wolves do no damage

Put the summary of the bug you're having here

What I expected to happen was...:
When i punch a wolf, it will hurt me when it attacks

What actually happened was...:
The angry wolf sort of nudged me around a bit.

Steps to Reproduce:
1. Go find a wolf in the wild or spawn one in.
2. Punch said wolf.
3. Watch as wolf does no damage.