Yesterday I found my white rock pullet sitting on the floor not able to walk. She would try to stand but her right leg seemed hurt, she tried to brace herself with her wings but just toppled down. I checked both legs, no sign of injury or pain in them that I could find. Her crop was empty so I gave her water and food right away. I put her in a dog kennel overnight with food and water. She is eating and drinking fine and laid an egg this morning. Her droppings look normal. She is alert and bright eyed, just can't stand and is panting heavily at times - though it is warm out and several other pullets are too. They all had merricks vacc. at the hatchery. They had medicated feed until about six weeks ago, have been laying for three weeks and are on layer pellets. Can anyone give me advice on how to nurse her? Any ideas on what's wrong, what I should check for? Thanks.