We have a chain link dog run we use as one of our chicken runs. We put 1/2 inch hardware cloth over the chain link with like 1,000 zip ties to keep critters out (after finding opossums in the coop and raccoons grabbing the chickens through the chain link gaps). We also bought corrugated metal and put it on as a roof. It's not the most elegant looking set up, but it works great for us.