I hope someone is able to help me with this. As the title states, I have a chicken with a possible leg injury. It seems to have happened overnight yesterday. When I went and let them out to roam this morning, she was limping out. I let it go after a quick look over and not noticing anything right away,but then it progressively got worse throughout the day.I seperately her inside. Now she is lethargic, labored breathing, stool is not normal. There was no obvious signs of predators and the coop is secure. I felt around her leg and I can't feel any breaks but I'm not an expert. Could it possibly be a bite or an infection? Any help is appreciated and thank you.