I have a 13 year-old gelding who has separation anxiety that is very manageable other than in a stall. I have worked with several trainers on this issue and successfully train and show him in dressage and eventing, as well as trail ride. I can take him away from other horses and/or be totally alone and he's fine. The stall is an entirely different ballgame. Some days he is fine, but most days when a horse leaves or I walk away he loses it, spinning, calling, doing mini-rears. He's a fantastic horse undersaddle but I want to show, attend clinics, go camping, etc, but he usually is a beast in the stall, which adds stress to any event we try to go to. He's out 24/7, worked 4-5 days per week, fed mostly grass hay 3+ times per day, and gets 1/2# Safe Choice twice daily. He is also on a magnesium supplement (MagRestore) as we were hoping that would help his anxiety. Any ideas are much appreciated, thank you!