A few days ago I found one of our roosters, who is about 13-14 weeks old, cowering in a corner of the run. He was balled up in the dirt and very wet. I figured he was just cold so I brought him home to put under a heat lamp but he did not improve. He does not really move around his box, he will kind of "scoot around" without using his legs and he is still pooping, eating, and drinking. I shot this video to demonstrate what is going on.
He will not use his legs for some reason. Any ideas?