I have a less than 1 year old Rhode Island Red hen that came up limping Friday morning. She appeared to be fine Thursday when I put them away in the coop, but on Friday morning she was the last one out & limping noticeably. She cannot put any weight on the left foot & hobbles around on the right. I put her in a kennel on Friday to rest her leg, and she has been there ever since. I have checked her leg & foot for any cuts, bumps, bumble foot, or anything out of the ordinary, but I didn't locate anything. They always fly up from the ground to the top of the coop every night before we put them away, a distance of about 4 feet high. Our chickens are free range & have the run of the property, and there were no attacks that we know of. She is eating & drinking ok, but mostly if we hand feed her. Could she have sprained her leg while flying to the top of the coop? If it's only a sprain, any idea how long for it to heal? Or could she have a tendon problem, and if so, what is the best way to determine that & how to treat it? We let her out attended with the other chickens for about 15 minutes to graze for a bit, then it's back into the kennel.