Chicken Little (sons chicken), my White Rock Hen, was free ranging last Saturday and Stormy, one of my Collies (who has always loved the girls, but was on prednisone so I don't know if that played a role) anyway, my grabbed a hold of here and pulled out a few feathers. My DH had to get Stormy off of Chicken Little. She was kinda in Shock since on many days they have laid in the yard or bushes together. I picked her up and gave her a quick look over and didn't see any blood and put her back in the coop/run. She spend a lot of time in the coop the next day, but it was getting really cold and snowing again. She was still eating and drinking. I would try to look at her closely when she was out in the run and when I would hand feed her some scratch, she seemed good. Well today, I went out and decided to let them out for a while since they seemed tired of being locked up even with the snow on the ground. I started to hold Chicken Little to stroke her back and noticed inside her wing was kind of wet, so I pulled her wing out a little and noticed she had been hurt. Up under the wing joint area was terrible blue green bruising under the surface and right where the wing folds her skin had been torn and smells like it's infected. I feel just awful. She's so sweet, my son will be devastated if we were to lose her. Is there anything I can do or need to look for? I don't know what to clean her with or keep the area dry to it could heal? She doesn't appear to be in much pain and her disposition is the same too. Also we only have 2 chickens, do I need to worry about the other one if nothing happened to her? Thank you for any help or suggestions.