Originally Posted by Rideabighorse
Horses are basically cold weather animals who have much less problems keeping warm than keeping cool. Blanketing really messes up their temperature control system. The equine school at Colorado State University did a study on horses keeping warm. They have 17 levels of warmth they can adjust their hair for if they are just left alone. Two things mess them up. Clipping and blanketing. I ave seen my horses in well below zero F temperatures and not seen them look distressed. Maybe if it was minus 30 or 40F I would worry about them. Minus 20 didn't bother them.
My horse must be weird, then, because this past winter it was a lot colder than usual. (Usually the coldest it gets is the lower 30's, upper 20's. This year it was in the teens to single digits.) He would be shivering almost every time I brought him in from the pasture to feed! He wasn't even clipped until February.