I know this has been asked a few times. We had two Black Australorps (10 months old). One was killed the other day. My current chicken is trying to create a pecking order with my dogs. I assume because she needs a buddy. I have found another approx 1 year old hen to add (cream legbar). I have one coop. They have the run of the backyard. Should I get a separate coop for the new chicken and fence off the yard to separate them then mix them after a few weeks? Should I let the current chicken free range and keep the other in the coop and run (I never close the run door).