Our flock of chickens is approximately 13 weeks old. My son is 10 years old and is one of the care takers of our chickens. Most of the chickens adore him and let him pet them, pick them up, carry them around, etc. They follow him around and hop up into his lap. Our rooster used to be one of them. He has been handled every day since we brought him home from the feed store and he used to be really friendly. Lately, however, our roo has taken to biting my son when he tries to pick him up or goes near him. Biting to the point of leaving a deep scratch that bleeds. Our roo won't do this with anyone else. My hubby, 12 year old son, and I can pick him up and handle him with no problems. He isn't as friendly towards us as he used to be, but no signs of aggression towards us. I am assuming it is because my son is on the small side. My son is confused by his behavior and doesn't know what to do. He knows about picking him up and carrying him around with him, letting the roo know that he is dominant over him, that is what he has been doing up to the past few days. He has swatted him, but that usually only ends up with him getting another bite. I don't quite know what to do as the carrying around thing has always worked for any roos we have had in the past and I have never had a biter before. I am almost to the point of telling my son to just let him be as he doesn't want to be friends anymore. However, I know from having roosters in the past that this is not going to get better if we don't deal with it now. I don't want to eat our roo (we will if we have to), but I really don't want my son's hands to continue looking like they do now. Any suggestions?