Is it even necessary? I'll be making my 'coop' starting this week, and we have a lot of rats. I'm not quite sure how to reinforce it so they can't get in. Do I put wire along the bottom part of the walls, then on the floor as well? Or is just the wood enough? I'm using OSB board for most of it. ETA: If I do need to use wire to reinforce it, how high up the walls and how far on the floor should it be?