My chicken got mauled by a dog a week ago. She has an injured (I think maybe dislocated) leg, and some puncture wounds, as well as some scraped off skin from getting a clump of feathers pulled out. All her skin wounds are healing pretty nicely, but she has developed a hot, swollen mass under her injured leg which is green. It spans almost the entire left side of her belly. She also had some gritty green stuff in her poo (this may be inconsequential, I don't know). Is it gangrene? I'm not able to post a pic. It may be bruising, but I would have thought this would have developed in a day or two. This didn't show up until day 5 or 6. I'm scared for her.