Yesterday I just discovered that one of my Rhode Island Red hens isn't well. She darted out of their house when I opened the door which is normal. When I went after her to put her back, she tried to run from me as usual and stumbled twice. At first I didn't think much of it because she had ventured into taller grass. When she tried to run from me on flat concrete and stumbled again, I knew something was wrong. She can walk just fine, it's just when she tries to run that she stumbles. Then when I was able to pick her up, I felt her chest and apparently she has lost a significant amount of weight during the past two weeks since I last held her. She is between 3 and 4 1/2 years old. So now I've been holding her in my lap most of the day and force hydrating and feeding her or I have her isolated in a separate kennel, next to the kennel with my RIR rooster who I have isolated since he started having what the vet suspects are neurological problems. I started both of them on the Vitamin B complex treatment yesterday. It's in a capsule form, so I puncture the capsule and squeeze it over their pellets which I wet down, and mix all together. No chicken in the rest of my flock shows these signs, at least not yet. Does anyone have any suggestions? Thank you.