I have a 12'x12' dog run that I surrendered to my bantie chickens. It took my a long time to make the plunge as I was very afraid they would be able to get out through the many gaps and openings that I was sure would be big enough for them to fit through. Finally out of shear desperation I got some 2' chicken wire and began by folding it in half, then opening it back up to a 90 degree angle to fit over each corner and running it the full length of the corners, all the way up and over, down and under. My kennel had those blasted rounded corners on it. The kind that leaves huge gaps at each of the corners and it needed a lot of attention to make sure they were secure. After the securing the corners came the door, lots of spaces there also. If you're raising standard chickens, I don't think you'd have to go through all the stuff that I did, but with the banties, I was just too paranoid. The door really drove me crazy for a while, but I finally figured out that I could run the chicken wire down the solid panel and let it extend out across the door hinge on the one side and the latch on the other. I only ran it up about half way because I didn't think the chickens would actually figure out they could climb up and wiggle their way through the opening at the top. Just didn't sound like a chicken thing to do. I then covered the top with chicken wire. I haven't started clipping wings yet. I get a kick out of seeing them fly and they seem to enjoy it so much, so I decided to let them at this point. The cover keeps them in and aerial predators out. I don't know if this has helped you at all, but if there is anything else I can do or any questions I can answer, just let me know. This set up isn't perfect, but it sure beats having chickens on my back porch.