Lots of chicken illnesses and injuries are treatable if caught in time and properly cared for. Don't hesitate and go see your vet when your chicken is not doing well. Find a local vet. Here is a list in the San Francisco bay area. And if you need specialist care, we highly recommend Dr Speer at the Medical Center for Birds. Not only did he save Sweetpea, but he also saved Lucie, one of our turkeys.