I moved into an amazing house that came with a chicken coop last year. We had a few chickens, but lost them from a raccoon attack. The enclosed run is built along the fence on two sides. One clever raccoon dung under the fence. The two other sides have deep fencing. One of my roommates suggested to dig a trench around the fence and pour cement. Has anyone tried this? Sound like a good idea? I have some wire to put up a skirt on the fence, but also have a fair amount of cement readily available.