This is the area we've cleared for our coop/run. It's a 9' wide area and the enclosure will be 8' x 45'. As you can see there is cement and block on one side and a bank on the other. I'm planning on putting welded wire under the entire thing and then cement blocks along the edges and filling around them. For the floor of the run we plan on a couple inches of rock, then topping with several inches of sand. (We'll also have a drain along the cement block side so water doesn't lay in there) I'm questioning whether the welded wire will be enough to keep anything from digging under? I'll be using hc for at least the bottom 4' of the sides so they are secure but I know there are multiple predators around and I want these girls as safe as possible. Thoughts, suggestions?