We typically allow our chickens to free range, though they have a secure coop and run. About four days ago, we had a fox attack in the middle of the day. My husband found one corpse, with two other chickens missing (large #s of feathers for two chickens). We began closing up all the chickens in our coop and run, and assumed the fox got the rest. This morning (about four days after the attack), one of our missing chickens wandered up to our back door. She (~3 yo Buff Orpington) has a huge gash on her back (~6" long), which has closed and is not actively bleeding, though it looks pretty nasty. She was eating and walking around (not drinking yet when I left for work... we gave her water with electrolytes). We plan to keep her separated from the other chickens inside. Should we try to clean the wound or treat it somehow? I am worried about reopening it, so many days after the attack.