I have electric wire around my coops and pens. I don't have a rat problem anymore. There are some places where instead of an apron, I dug a trench under the fence a good foot deep. I used 1"x2" welded wire I hog ringed to the bottom of the fence. With the electric wire and the wire buried a foot deep under the fence, nothing is getting in and so far nothing has. Everything I have done over the years was because of losses from predators. Good luck and have fun...