We have chickens that free range in the yard during the day. We also have 2 minature (not so minature) Australian Shepherds that live in the backyard and keep predators away from the chickens. Our issue is that the dogs have started eating chicken eggs. We are currently adding on another chicken coop and bigger house to the existing. Any suggestions on doors, nesting box location, etc...that will keep the dogs out, but let the hens in to lay?? Thanks!