Hi. I grew up on a farm. My grandmother always had chickens. I don't remember her rooster ever attacking one of her hens like mine is doing. I have 9 hens 1 rooster. I had them 1st. Then he came when they were grown and he was still young. They picked on him soooo bad. Well no more. He soon became ruler of the roost. But, he has decided he does not like one of the hens. She is not allowed to come out of the pen. If he sees her even start to come out, he runs and pecks her, chases her back to the pen, then scratches his feet like "ha, guess I told you". We had to put food and water in the pen but then she has gotten so weak she cannot walk. We removed her from the pen. I have her in a small area with a little fence but I want to eventually introduce her back to the pen before she gets eaten by a racoon or coyote. I may sound silly but it's a long story. My 27 year old son passed away from brain cancer, my grand daughter LOVES her chickens. We cannot do away with one of them. They are her babies and she COUNTS them. What can I do to make this silly rooster like this hen? He is not aggressive to us, only this one hen.