I had a neighbors dog come into my yard and attack my bantam cochins. I let them out to wonder the yard for a few hours each day. The only injury I found was on my buff roo. His tail feathers had been ripped out and the skin was red and slightly bloody. I cleaned it and he acts fine, ate with his hens and jumped up on his roost. Doesnt act bothered by it at all. I checked the feathers and there was no skin on them so I assume the flesh wasnt ripped off. I hope I did everything right, I wasnt sure if triple antibiotic was ok for chickens but I rubbed a lil on anyway. He is such a sweet lil thing, one of my smallest bantams. Just breaks my heart to see him hurt. Hope your chicken does well.