For all you people who have bullying problems with their chickens , especially those whose chicken is injured and getting bullied, let me tell you my story. My Rhode Island Red was limping a few weeks ago terribly! When she walked she tried as hard as possible not to put any weight on it. It was extremely painful for me to watch. I then decided all I needed was answers. I checked her foot for any puffiness, swelling, cuts or scrapes, and most importantly bumblefoot. I knew how to treat it but none was visible, nor was there anything that might have the slightest resemblance to it. But the worst part was that she was getting bullies. If she made contact with the other chickens they chased her and pecked at her. When we would let them out into the yard she would just hide under the trailer and dust herself in the gravel. When they were in the run, she would hide in the nest box and I would have to hand feed her. A few days later, after I did some research online, I read that she might have a sprained ankle and we needed to isolate her. I volenteer for a wildlife rehabilitator so I borrowed a cage from her. We set the cage up in our barn and gave her some food and water. After a week or so her limp was noticeably better so we put her with the other chickens. That didn't work out so well.Again they chased and pecked at her. We decided she needed to get out of that small confined space and doing something else besideds just sitting there. So while the other chickens were out in the yard, we put her in the run to run around. And vise versa. At night we had the cage in the coop for her to still be with the other chickens at night. While her limp was improving, my dad was calling people to see if they wanted a chicken. I was completely devastated and mad that the other chickens were picking on her. One day she was running around in the run and I noticed she was barely limping, so I let in some of the other chickens in with her. They didn't even peck at her!
I was sooooooooo happy! On that happy note, we started letting her go up on the roost at night with them and being in the same area as them. Soon enough she was laying again (because she was in a funk) and doing everything else with them. We were still careful, like keeping the windows open in case we heard any squabble, but nothing did happen. Right now she still is a little cautious around them, but everything is now okay! The point is, that sign of weakness, makes the other chickens think they're stronger and better, and don't want any weakness slowing them down. With this coming from an 11 year old, it's pretty cool (to me) that such a dramatic change can come and go so quickly in life. I hope this helps with any of your problems!
