I'm in a very urban neighborhood and my house sits on 1/4 acre (front and back). My four buff orpingtons are in a 8 x 8 run during the day. We started letting them out into the yard a few days ago for a few hours at a time. Now, every time we open the back door or pull into the driveway they go absolutely crazy. They all run to the run door and start yelling at us. I know they want to be let out into the yard. Major guilt. Is our run too small?