Our run is built out of chicken wire. We had 4 hens that used this run for about 6 months with no issues. They were locked up tight every night in the coop. Sometimes the chicken door would stay open very late ( dumb on our part) and still everything was ok. One night we lost them to a weasel who got INTO the coop through open vents. Since then, we've made the modifications to the coop with hardware cloth and it's sealed up super tight. We are now raising 4 chicks....they are 5 weeks old and are out in the coop but have not been let out into the run yet. I want to be sure they know how to maneuver the ramp to get in and out before I leave them out for any length of time. ( I work all day so they would be out for hours at a time.) I'm also starting to re think the construction of the run. It's amazing how your views change when you raise something from a day old and get very attached. My brother who lives the next town over has lost many hens to a coyote who has no problems stealing them in broad daylight with a doberman in the same yard. ( free ranging ) So my question is this. Would 2x4 welded wire be enough over the chicken wire? I'm worried about weasels, but again, they are locked up tight at night in the coop. I suppose there is still a chance these tiny critters ( small enough to get through the wire and into the run) could come out during the day. ?? Of course, it's the same thing you read everywhere on this board. I'd rather not have to buy hardware cloth for the entire run if I don't have to. Many people do it, but I also see many that only have welded wire. Thoughts?? Suggestions??