I had something similar happen today to one of my hens. They were free ranging on the lawn...and I believe my dog attacked her (I can't be sure because I didn't see it happen). The wound is on her backside....and her tail feathers are pretty much gone. She is limping...though I haven't noticed any wound to her legs or feet.
She is still eating & drinking...but haven't noticed if she is still pooping (her skin is completely showing in that area...no feathers left there at all!)
Should I put something on her wound?...and if so what?
I would take a photo of the wound....but she won't let me near her right now.