I have only had chickens for a year.And I only have three.A rooster and two hens. One hen is more dominant,follows other constantly, always moves in where other is eating in yard, has attacked her at feeder,we have seen her pecking the other one lately too on neck and backend.So anyway, the rooster seems to prefer the less dominant one who also has been laying more eggs consistently. Her back is bare and we are giving her antibiotics for a wheezing sound and have separated her for a few days.I have also ordered a saddle/apron for her back.I think we will take the more dominant one and put her in a smaller coop for a few days when we put Maggie back in.Someone had said something about the pecking order and we feel she needs to be raised up higher in the flock (3!)That's the only thing we have thought of so far. Hope it works! I have been really worried about her,but she's still laying eggs. She's such a good little chicken.They also have some things you can put on chickens for pecking, on their beaks to stop it..i think.Peepers?If our first plan doesn't work I am going to check into them more.