our coop has metal siding on it. It is dug down two feet Thats where the metal siding starts. The run is also dug down two feet. It is made of welded 2"x4 "wire. Around the inside is chicken wire to protect the chickens from being pulled through the wire if caught napping. The top is the same 2" x4" wire. All windows have 1"x1" wire on them.We have to keep our chickens in a pen as we are adjacent to the wildlife management area. We do however have an old rooster and hen that freerange. So far they have been safe.Predators don't come to close during the daytime with the goats,pigs,and dogs. We keep then tightly closed at night in their own little coop. All our coops have floors to prevent anyting digging under.Even with all this protection we expect to lose something some day All you can do is to try your best to protect them.I also don't think I could shoot a predator so far the only one we have had is a snake and my son relocated that.