sgall - I think Chris09 has good info here, and you should listen.
Also, the Poly Vi Sol with NO iron has worked for me on younger chickens when they have had this issue. In a young chick under 8 weeks, I only give a drop or two, depending on size. Exercise the legs and feet too. I just had an LF Cornish do this about a month and a half ago as a 4-week chick and thought I was going to lose him. I used the vitamins and kept doing therapy with him and he was up and walking on his own again in a couple of days.
I hadn't heard dog food being a good thing to give chickens, but I have heard of cat food in limited quantities due to the salt content.
But, like I said, I think Chris09 has enough experience that you have a good answer to go with there. I like the liver and spinach idea, it seems much more natural.
Oh, and as for the poop thing, you may want to look up the "chicken poop chart" there are many different appearances of chicken poop that are in the normal range, and it sounds like what you are seeing is a normal appearance. Just look up on here or Google, "chicken poop chart".