Hi all! I am looking into getting chickens again for the first time in years. I would be starting all over again. My old coop was an old she'd that was nice and big and we let our chicks roam around the yard. We have since moved and got a new dog. I am afraid to let them roam now since we they would have to share the small yard with the dogs. I am looking into a coop with a small attached run but I am not sure it is big enough for 4 chickens. It's is 40"x84"x57" is that enough room for them to have yard time?