I recently bought a different brand of food. Pellets are much larger than the other food. One chicken has green diahreah and the other does not, but both chickens poop looks like broken down, yet undigested food and pieces if grass. Is it the pellets? I've given them both yogurt which seemed to help temporarily, then when I gave them pellets one was sick again. I am also concerned that they sometimes peck at dog poop and one dog is on antibiotics. I try to keep it picked up.