Hi, I'm in desperate need of advice.. My 17-week-old cockerel has a very stiff walk. It started about 4 or 5 weeks ago when the temperature started going below zero. He would have a very stiff walk that I assumed was that he thought it was cold and unpleasant outside. I had read that chickens will do fine in cold temperatures as long as it's not humid, which it wasn't. So I was optimistic and thought "he'll get used to it", but he didn't seem to get used to it, and was having trouble with his balance (if he was trying to balance on something) and when walking he lifted his entire body with each step as if to help the leg lift off the ground. The others seemed fine. They weren't enjoying the cold weather, but walking fine. I don't know if this has anything to do with it, but in case it could: out of the blue I found one of my cockerels dead one night when checking in on them (it was about 44 degrees F at the time so I can't imagine he'd freeze to death). I immediately thought that it must be Marek. He had just a few hours earlier seemed completely fine though. So I gave him to the vets to open him up and take a look. They couldn't find anything wrong with him. He looked completely healthy and in good shape, no organs looked out of the ordinary. I showed her a video of my cockerel with the stiff walk and asked what she thought could be causing it - she said it looked neurological and that she couldn't really do anything about it. So I went back home and since the vet had at least told me there were no signs of Marek in the dead cockerel I figured that it was probably not the cause of this one's strange walk. So maybe vitamin deficiency? I've given them multi-vitamin in their water since they were chicks but I thought maybe he didn't absorb the vitamins as he should. So I added some vitamin B (a mix of B1, B2, B3, B5, B6, B7, B9, B12) and I thought over the weeks that he's gotten a bit better. He's walking with a bit more ease, and can have those little happy running around moments flapping his wings. He's eating, drinking, going outside, dust bathing etc.. everything a normal chicken does. But he still has a stiff walk. And today when I let them out it looked a bit worse again. Not as bad as in the beginning, but still. I don't want it going in that direction. I'm at a loss. Since his stiff walk started after the temperatures dropped below zero I don't let the temperature go below freezing inside of the coop anymore (even though it might be completely unrelated). Some videos: Side note: At the end of the second video I thought I saw something beneath the dirt on the backside of his foot. After removing the dirt I saw this: Is it bumblefoot? It's quite flat and hard, not red and swollen like most pictures of bumblefoot. His feet are dry and sensitive, he has on a few occasions scratched open the skin in between his toes cause he stepped on his own foot and his claw made a red little scrape wound (not bleeding, as in dripping blood, but the wound would leave a tiny blood print if I put a paper towel against it). Could these little wounds cause infection problems even though they don't show any signs of infection and heal on their own? I don't know. Maybe I'm going completely off track with things that are completely unrelated, but just in case it could be the result of the same underlying problem. Please, give me all your thoughts of what it could be, it breaks my heart not knowing how to help him.