This is my second chicken with the same symptoms. She acts weak legged, can walk, but looks painful and very slow. Lays on floor in coop. Doesn't go outside when I let the others out. I lost a girl last week with the same symptoms. She ate the day she died, but had lost alot of weight, but no other symptoms that I saw. Poo looks normal. I just feed her a hard cooked egg for extra protein. I feed layer feed. I have been putting vitamins & electrolites in the water. No bugs that I see. Her feet are not swollen, although one thigh joint may be swollen, can't really tell though. What can I do? What is this? She's housed with 15 other chickens with plenty of room. I don't want this to keep spreading. thank you all for your advice in advance.