Armor Lee,
The Wolf can be useful, if you have more than one. The key to using the Wolf is to have the Pack Leader at least 10-15 levels higher than the other Wolf towers. (personal opinion/use with it)
I've tried using the Wolf on 12, 13, and 14, with the Pack Leader on 13. This seems to work for a bit, but I replace it later.
What I would like to try, is using the Wolf on 15, 16 (Pack Leader), and 17. This is far down my list of strategies to try right now, so I won't get to it any time soon.
Hope that helps you out!