I've got a problem!! We have a "bird dog" so we built an additional fence around the chicken yard. The eagles across the road nested and doubled in population so I put a net over the chicken yard. We had raccoons so I put chicken wire at the bottom of the wood fence. Now I've got ?rodents? tunneling under the yard and the coop and cleaning out the feeder!! The chicken yard "caves" in every time I step onto it. The droppings are huge so if it's a rat, he is ginormous!! What is the best way to solve this????