I have a 5 year old hen, Hazel, that has the same symptoms! A couple of weeks ago her butt looked awful so I brought her in to clean her up and her lower abdomen felt like a balloon. I've just kept an eye on her b/c she seemed active, happy, eating etc. But now she is sleepy a lot and then the other chickens were really picking on her and she is loosing weight, and still has the poopy butt. We've never culled a chicken before but I feel like that is what needs to be done. I was treating her with ACV, but obviously that is not working. Now I'm trying an antibiotic and she is isolated. I am so sad and hate this part of owning chickens.

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