Only slightly related is the excellent Arkady Renko novel Wolves Eat Dogs which is partly set in the Chernobyl exclusion zone (and touches on the wolves that have taken over that area):

https://en.wikipedia.org/wiki/Wolves_Eat_Dogs

Also, there was a great episode of Nature of PBS about this too:

http://www.pbs.org/wnet/nature/radioactive-wolves-introducti...