So, We're doing out entire run(except it will have a proper roof since it rains here constantly) with 2x4 welded wire fencing, as we can't afford to buy enough hardware cloth for the entire thing. We planned on getting 24" wide hardware cloth to go around the bottom so nothing can reach in and grab the girls, but I had two other ideas, and I thought I'd run them by you guys for your thoughts. Idea #1: I thought we could use the welded wire for a second layer of fencing around the bottom two feet, but offset it an inch from the first layer so it's basically 1x2 inch holes. I'm not sure if I explained that well... Basically we would add the fencing the same way, just moved sideways one inch and up two inches so it isn't lined up, making the smaller holes. We're planning to sandwich the fencing between the 4x4 posts with a second 2x4 on the inside (fencing in between) so it's really secure. Does this sound like it might work? I figure it will, since it'll be really secure and the holes will then be so much smaller. We have raccoons, opossum, feral neighborhood cats, and a potentially chicken eating Aussie shepherd to worry about. We live in a very urban area, so during the day isn't really a worry so much, and they will be locked in the coop at night. Idea #2: We are planning to use 2x8 boards all the way around the bottom of the run to keep the gravel and sand in, so my other thought was to use 2x12 boards stacked two high (so 24 inches high) all the way around, killing two birds with one stone. Keeping the gravel and sand in, and predators out. I like this idea better than using the fencing overlapped, as I think it will look nicer. We plan to build garden boxes along a few of the three foot stretches between posts anyways, so this just eliminated having to build the back part of the boxes as well.. Thoughts?