We had three chickens and lost one a week ago on a hot summer day. Out of the three, 2 of them lost weight, stopped laying, had runny stools. The stools look just like the photos for clostridium perfingens. They were wormed with wazine months ago when symptoms started; followed up a month later with ivermectin. Nothing changed. Two days ago Victoria, our buff orpington came out of the coop and wasn't able to eat. She was pecking at air and missing the food like her depth perception was off. I tried all her favorites without success. Yesterday she started to eat yogurt mash, her perception somewhat improved. She can see because she goes after the dropped food. I have human 100mg doxycycline caps, probiotic caps and nystatin liquid on hand. Worth trying? doses? At this point there is nothing to lose and will try anything to help her. Anything I can give her to firm up stools? Any suggestions? They are 2.5 years old. The third girl (gold lace), is very robust and healthy and still laying eggs. A bully situation perhaps. We are heartbroken.