Sometimes I just don't have any wolves I want to enter, or I already entered them more then once. It kinda effects my relationship with my wolves a bit too. And can be a bit frustrating when I really love the wolf I have and they don't place.
A simple option for me to just get the regular rewards without the extra one if you place would be nice, plus then there wouldn't be a weird competitive edge having my own wolf in the same pool as the wolves I'm voting for.