On our land we have wolves and coyotes. The local farmers driving around their properties at night see numerous cases of coyotes with fawns in their mouths in the spring. We kill every one we see during gun season. Wolves haven't seemed to bother the herd.
Last fall one of the bowhunters on our land saw a huge cougar going in it when driving by in their car. THAT could hurt the deer herd.
Sfury, take a look at the DNR wolf location chart below. We hunt by Westfield in Marquette county which is in the MIDDLE of the state. They are NOT just up north anymore.
http://dnr.wi.gov/org/land/er/mammal...tm#territories
http://www.uwsp.edu/wildlife/carnivo...0Wisconsin.pdf