Currently around the coop there is a 4' tall chain link fence. Obviously, that isn't sufficient. My thought is to expand it to 8' tall chain link and back it with that wire mesh stuff whose name I have temporarily forgotten, then do some chicken wire on the top to keep the hawks out. I have a dog that keeps raccoons at bay and will put the chickens in the coop at night, the coop itself is very secure, it's just the yard I'm worried about now. Would that be sufficient, do you think?