One of my 4 backyard hens (I call them the View Girls, Barbara, Whoopi, Christine and Joy) started stumbling about and limping today, then just hunkering down on the grass or dusty hole. I caught her but found no injury or painful areas on her. I have her in a box in the house and just now in examining her again a dry 3/4" piece of skin popped off her leg leaving a bloody area exposed. I'm wondering if this is what is bothering her. What should I do? My other hens seem fine. We have had a lot of rain and the chickens are in my garden where the sprinklers water as well. I'm wondering if it is too wet for their feet? They do have a dry hen house.