Before I go into this, I just want to preface it this, that Will is still going out during the day. He's just coming in for the night, now. His stall is around 15x15 if that matters. I just need something to occupy him when he's not sleeping. Other horses have salt licks or jolly balls. But I've heard that in the cold, salt isn't too appealing and he doesn't like playing with things - isn't curious enough to try as well.