Edited by Husker Hens - 10/10/15 at 8:41am
We just finished building our 9 foot X 20 foot run. We dug the entire area down about 6 to 8 inches and laid down fencing which also extended past the run walls. We then attached 1/4 inch hardware cloth around the entire run and wire wove it all together. It took us about 3 weeks to complete but in the long run it should help keep predators out. We have a wood track behind our yard which we frequently see Raccoon's and Fox. Lots of Hawks here as well. The top of the run is also going to be galvanized fencing.
Hope this helped!