I'm building my run around an existing 14'x20' chain link dog run. Will have to replace the gate with something to close down the gaps. Will also cover the top with 2"x4" welded wire. My question: Is the chain link good enough against predators? I read some warning about racoons reaching in or chicken heads coming through. But the chain link opening seems small enough, less than 2"x2". Can the coon reach in through it? and how far in? I image with the racoon around, the chickens will run know to stay away from the fence! Am I wrong? I heard that I should cover the bottom part of the fence with smaller opening chicken wire. But I spent enough money on this project it's beginning to hurt! Also, my run is build around 2 redwood trees, and the ground seems pretty tough. It's hard to imagine that a coon can "dig" under the fense to get in. Can it? Do I need to run smaller chicken wire along the base, folding out, to prevent racoon digging? Please advise. THANKs!