I have 3 Hens. 2 have a dirty rear end, they'll be a year old in May. They're laying daily, eating & acting normal. Poop seems normal & have never seen worms. I realize that not all parasites are visible to the naked eye. I'm unable to get a fecal float done. The other hen has a nice clean bum, but she's around 4 and hasn't laid in months. They free-range & rarely get treats. They eat pellets & wetted pellets/kinda fermented. They have plain water, water with some ACV always available. We live in Florida & they've already had electrolytes water a few times this year. I tend to offer that in addition to their other beverage choices once we hit mid to upper 80's. I've never wormed them & think it might be something to try to see if their bums stay clean. I have no problem putting them in a bucket to wash their bums, but never had to do it to other chickens, just these two. Any suggestions or advice would be greatly appreciated! Thanks!