I have 8 free-range barred rock hens (around 3-4 years old). All of them have been very healthy, they would lay often and stay a good weight, but I had noticed that one of them seemed to be gaining weight. I didn't think much of it since she was acting fine. But as she gained weight, she became lethargic. Just these couple of days, she just sat in one spot, move to another if she needed, and sit there. I also noticed that for a couple of days, she would go into the coop early to sleep. Now today, my mom discovered that she had blood. Her stool and her vent were bloody. I think the vent was also prolapsed. She didn't want to move at all, and I could tell she was in a lot of pain. She was just sitting there and closing her eyes, and it broke my heart :'( .I separated her from the rest of the flock so she wouldn't be bothered by the hens. First I want to know what this is, and if it's contagious or not. I assumed fatty liver disease, since it somewhat fits the description. She looks to be constantly straining, and she is also very obese. But the thing is, the other hens are perfectly fine. They are all free range and will graze on grass, they get chicken feed in the morning and evening, and vegetable scraps usually once in the evening. Another possibility is that she is egg-bound. I can't tell since I have 8 hens, and it's difficult to keep track of which hen has layed. Second, how should she be euthanized? I know that at this point, treatment probably won't work, and I just want to end her suffering. What would be the humane and calmest way to euthanize a hen? I have heard of breaking their neck or decapitating them, but I can't bear to see that happen (my dad will probably do it) and I also fear that he might not get it right the first time, and the chicken is still conscious and suffering. Is there any chamber-type methods? I recall my dad had euthanized one of our pet rats using a container and some chemical, so I wonder if there's a similar method for hens.