I just purchased a pair of Sloggers slip on shoes for this reason. Love them! There are ones with a "back" on the heel and ones with no back. I am an 8.5 and and 8 fits perfectly.
I have a 5 week old bird that looks just like yours. It is constantly pecking the other chickens very hard and pulls on their feathers. I put some white vinegar in his water last night so we'll see if that helps. He is really on a mission and the other birds run from him when he gets near. I...