I had a sick chicken ( Kera) that a brought into the house back in January. I am working on reintegrating her back into the coop. Today she was outside for the first time and 2 different chickens who always seemed docile jumped her and attacked her neck. I was ready and broke them up quickly. I put Kera into the outside pen area and left the other chickens outside the pen. The sick chicken loved being outside and took a nice dust bath. The other chickens were trying to get into the pen instead of free ranging. I brought Kera back inside because she isn't used to the cold in the coop. I will try again tomorrow to see about them getting along.