@Sonya9 - I know this is a very old post, but I have a rooster showing the same issue with his right leg and foot. I have also had Marek's in two hens (they both had droopy wings but never a limp or anything, before ultimately passing within a few days) and this does seem different to me as well. I had him isolated in a place under the chicken coop during the day - he could walk around but was limited to that space, and then let him out to roost at night with the others. However, he seems to have gotten worse. Where it seemed to be his leg - he swung it - now he drags his foot some. He can use the foot, but wondering if it's a tendon issue causing the foot problem now. My friend thought he perhaps was overbreeding and sprained it which seems possible, or he did it jumping up and down from the coop or roosting rods. In any case, I have now put him in smaller captivity in a large cat crate with food and water in the hopes that more forced rest (rather than pacing under the coop wanting to chase hens) will help him recover. It's cold out but I think he'll be fine during the day, and I think I'll put the crate in the garage overnight to protect him from the worst cold without moving him completely into the heated house. I can't take him for an x-ray, it's too prohibitive, and I see no obvious wounds or issues on his foot or leg (no bumble foot or lacerations). Hoping I have success like you!
