One of our chickens has no feeling in one of its feet. We have taken him/her to the vet and they have confirmed this and recommended aqn xray to see if it had broken anything. Xray came out clear with no breaks, so we've assumed its tendon damage. He finds it hard to walk and it collapses under him, he will walk from one end of the run to the other, but the other chickens are now excluding him and he is very hungry if we hand feed him. We don't know what to do, putting him to sleep seems kindest, does anyone have any advice as to what we can do/how it could have happened. When touching the foot he doesn't feel any pain; it just has no feeling, doesn't clench or anything. But his upper leg is fine.