Hello there! I'm looking for information on building a small backyard coop, big enough to house 2-4 hens, and very dog proof. Our dogs will be curious about it, and I would like to hear from anyone knows how to make a coop dog proof. The dogs range from 40-70lbs, so it would have to be strong enough to withstand their "curiousity." If anyone has any ideas/tips for dog proofing a small backyard coop, I would love to hear them! Thank you!