This is a great idea if your run is to big to cover the bottom with hardware clothe. I use oak and pine rounds around the exposed sides of my fencing. Just think dig dug if any of you remember that game.
[COLOR=333333]I drove 2' long pieces of rebar every 6" around the run. I used to have issues with fox digging under but it's been over a year and so far so good. I could see evidence at first that they were still trying but after a few weeks they gave up. I drove them down two feet at a slight angle away from the fence so if something wants to dig under they will have their work cut out for them.[/COLOR]