Hey everyone, new here, but I've been coming to this site every so often when I've had to look up chicken-related issues. As the title says, recently one of our hens has developed diarrhea and refuses to leave her coop. For context, we only have three chickens in our yard. Two days ago we'd finished treating one of our other hens for worms and placed the medication in everyone's drinking water. The hen with diarrhea did not display any symptoms of worms, and was actually perfectly healthy before this. I was just wondering if it could be the medication that's upset her stomach or something since she technically didn't need it, or if it could be some other problem. She's also crouched down with her butt in the air, but it doesn't seem to be an egg she's having trouble passing.
