What is wrong with my chicken

[lamanash]

My chicken was attacked by a dog 3 month ago, but I was able to safe her life. Since that, I notice she lost her feathers and they not replaced. Also I did not see any feathers left somewhere in the coop or surrounding area. Can someone tell me what is wrong? All other chickens are ok, and did not have any bold spots.

 

[BigBlueHen53]

Hi. Did your hen lose these feathers as a result of the dog attack, or later? If the dog tore the feathers out, they may not grow back until the next time she molts. How old is this bird?

 

[lamanash]

My hens 18 month old. I believe during the dog attack she lost less feathers and looks like after that her bold spot get bigger and its stay the same for several month. Another chicken lost her feather on her butt , during the same accident and her feather grow back long time ago.