I have a RIR rooster that is approximately a year old. I have had him since he was about 2-3 months old. He has been healthy, had no major problems but he has been picking on one of my hens. Two days ago we moved him out of the coop with the hens to let them rest. He was fine until this morning when I went to check on him. He just lays around and acts like he cannot move his right leg. His other leg appears fine, and his right leg does not show any swelling or abnormalities. Its just stiff. He also has poop residue around his vent area and has not pooped much in the cage he is in. Any thoughts on what I can do for him?