I have a hen who is not doing so well. She is inside now, in my brooder. She was so lethargic and limp, I could barely tell she was breathing. I can tell she is dehydrated, her eyes are sunken in and her skin doesn't snap back into place right away. I syringed her some electrolyte solution mixed with corn syrup.
When I found her she was very cold, and in the coop. She was in a nest box with a broody, snuggled as closely as possible. At first I thought was was laying an egg. But when I lifted her up to check under for other eggs, she just kinda hung there weakly and didn't protest. Not normal! Her feet look like they have some frostbite damage, too.
She does have an injury though. On the underside of her beak. I found it when I was giving her the solution. When I dripped some water IN her beak, a drop appeared under her chin. I thought I spilled. Nope, there is a hole there. The mean rooster I butchered yesterday HAD been beating up on my girls. So I think if she got wounded, and most of the water she drinks on her own drips through her wound before she can swallow, she quickly got dehydrated. I know dehydration can set an animal up for frostbite, too.