Hi! I just moved to the country and we are building our pen to be first-time chicken owners. I have a German shepherd and two barn cats. Should I start with pullets as opposed to chicks to get my animals used to them? I'm pretty sure my dog will be fine either way as we have a small indoor bird who walks on the floor at times. More worried about the cats. I would rather start with chicks. The chicken yard is fairly large with a 6' fence around it.