My 2 yr old welsummer roo has developed a swollen foot and limp, he seems fine in every other aspect, I have kept chickens for 3 years now and have never encountered this particular problem....I have looked for a briar or other injury and can't see anything wrong, it's not broken because he can walk on it, it is more swollen on the bottom of his claw underneath, at first I was sure he had just poked something in it, but it is not getting any better....