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My girl is doing great this morning, after more normal poops. Still has a tennis ball-size swelling. I'll keep watching.
I am having this same issue with one of my Welsummers. I noticed a swollen butt area last night when I went to close the coop. Her rear area hanging over the roost looked extra big. I felt it, and it was a bit squishy, but it didn't seem to be bothering her. I thought maybe she hadn't laid that...