I'm going to have 4-5 chickens and my backyard is not fenced. They have a 6x12 pen with their coop inside that is off the ground so they have more square footage, but I really want to give them some yard to play in the grass and dirt. I was thinking of making a little moveable pen to put them in for a few hours each day and move it around the backyard. Is this an ok idea if I have a pretty small backyard or will I just end up with dirt for a yard? Lol advice please!