Ok I have 5 chickens. My husband made a beautiful coop and attched run that is extremely secure. The run is filled with sand and right now everything is perfect! We live in town, on 1/2 acre of land. We want to make a free range run up a decent section of our property. The area will be to 20 feet wide by 150 feet long. We need to enclose it because of our dog. We want to just use chicken wire and welded wire fencing together and it would 5 feet tall. My question is what about the top. Do we need to cover? Will they fly away? They will only be in this area when we are home. Please help, don't know where to start. Thank You