I'd say that mare looks about ready to foal. I think you could use your run in shed if you can block the front as you said you can. The biggest thing is to make sure the foal is up off the ground with plenty of warm bedding and no drafts.
You say the mare has no bag? Have you felt her udder? Some mares, especially maidens, do indeed have bags but they can be small. I would feel for firmness and nipple placement. When she is ready to foal, the udder will become firm and the nipples will fill and spread apart. If you try to get milk out of her, it should feel thick and sticky when she is ready to foal.
In the past, I have used a childs sweatshirt in a pinch for a foal blanket.
Good luck and keep us posted."
Just one thing on the run in shelter. The run in shelter is probably not touching the ground on 3 sides, let alone the open front. The cold air will definatley get to the foal unless everything can be blocked off. I know someone in Wisconsin who had a foal last year and the mare could go in and out of the barn as she pleased. The foal was born in the barn and the temperatures went down to freezing that night. Unfortunatly the foal died of the cold that night too. He had been born alive, nursed, even dried off, but was dead in the am when she went out to the barn.
I do not mean to scare you, but I would certainly play it safe. It can really get cold here, we have been running over 23 days with below zero temps, with it gettig down to -14 degrees with windchill factors of -40 below. That is COLD!! I do not know where you live, but based upon the snow in the pictures, I would guess it gets pretty coold there too!! A foal born to those kind of temperatures after being in an environment of 100+ degrees, it can be hard on them!! If you are going to use the shelter, make sure it is totally inclosed so that the mare can not get out, nor can another horse get in. Use heat lamps and thick staw bedding on the ground for warmth. If you can pile straw bails on the outside of the shelter too for extra insulation that also will help.
A dog blaket or a childs sweatshirt will help too. The foal will do alright in the cold after a few days, but it will still need the shelter area.
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