I have a 4yo hen (and possibly a 2nd one) who has had diarrhea for 4wks now. My other 10 hens are fine. I have taken all of the advice given and think I need to go to the next step. I've been giving her probiotics in the water, yogurt daily, no table scraps. She's happy, eating great, clean vent and butt feathers. Nothing changed prior to the onset of diarrhea meaning no changes to the flock, food, coop, ect.... I think I need to take treatment up a notch. I work with cats and dogs in a vet hospital but we don't treat chickens. Besides, the wealth of knowledge I find from you all on BYC is incredible!!! I have access to, meds but am unsure of the doses. At this point I'm not sure if i should deworm the group. I'm also thinking of starting metronidazole. Any thoughts?