Originally Posted by Saddlebag
I put hay in there three weeks ago and it's still there. They went in grabbed a mouthful and left. We had wind and fine wet snow today and he wasn't shivering so I didn't try the spray. His coat is a little thicker than it was three weeks ago when it was wind and rain. Blanketing, some horses consider a blanket fair game to relieve their boredom. They are too expensive to be replaced every few days.
So you must not regularly feed them in there unless you are saying they have not eaten at all in three weeks. Why not feed them in there all the time so they get used to eating in their shelter?