Aside from acting more nutty than usual, mares will squat and pee, accept attention from a stallion, and "wink" their vagina; an opening and closing motion, that once you see it, you will realize what it is. They'll also be prone to prancing around and lifting their tail more.
There isn't much you can do to stop a horse from coming into season. This is a natural occurrence.
Winter I should imagine.
You should cover a horse in WINTER
Horse stomp there feet when they get tried. This does not mean that your horse is mad at you.
If You mean the horse with the feathers, i think you mean a Shire horse.
what does dour mean in horse racinhg
autumn
winter
autumn-winter time
in the spring time.
Winter
It is not common, but it is quite possible.