I have a RIR hen that was the runt of the group I got last March. She is laying now and doing well but lately I've noticed that her butt is crusty with a small amount of wet droppings. So I brought her in and trimmed the little bit off with some scissors and made sure her vent was all clear, etc.. That was all fine- until I smelled her mouth. It smelled horrible but not necessarily "sour" so I'm not sure if this fits the bill of sour crop? Also, her crop was firm, not squishy at all. None of my other hens smell this way and I think this is a recent thing with her. Any ideas? Could it still be sour crop? Or an intestinal thing. What would be the best way to home treat? Tested for worms about a month ago, all good. Hadn't fed anything out of norm of scratch/feed to the flock either lately. They get cottage cheese/yoghurt regularly & vitamin/electrolyte water. Thanks