I once had a chicken about that age who after the necropsy I determined there was a blockage, (almost tumor like), in the intestine. I had to put her down, when she could no longer stand and get to the food and water because of her weight.
Strangly enough she never seemed to be in any pain. The backup in the intestine was substantial, (it never ruptured).
You would have thought she would have been in pain.
It could be something similar only closer to the vent.
Just my two cents.
I'm so sorry you have to deal with this.

Strangly enough she never seemed to be in any pain. The backup in the intestine was substantial, (it never ruptured).
You would have thought she would have been in pain.
It could be something similar only closer to the vent.

Just my two cents.
I'm so sorry you have to deal with this.
