I have thought for years that Foxy is an IR horse. I think this has been an ongoing problem for years.. and the only problem. I would be surprised if he had any allergies or PSSM. I think this is his issue and has been for forever. Equine Endocrine Diseases: The Basics | AAEP He is always looking too fat IMO. But... that seems to be a theme with show horses, especially AQHA show horses. He's always had a cresty neck. He doesn't look fat compared to other show horses, but he is fat and has been for awhile. I've got the same kind of "fat" with Coal. Show people say he looks good, but he's FAT. With Coal, we really struggle. I think I've told you what has worked for him in the past ... but just in case: feed him by weight, not volume. He gets 1.5%-2% of his weight in forage, and if he's getting grass hay it has to be tested low NSC or soaked. It is easier for me to feed alfalfa, because then I'm not worrying about NSC. He gets fed in a slow feeder hay net. IF he's on pasture he's wearing a grazing muzzle. He can have a ration balancer, but it has to be soy free. I used to keep him on Equipride. I have also had good results keeping him on timothy or alfalfa pellets with a loose vitamin/ mineral on top. Chromium supplements help; I like Quiessence. Lots of walking in addition to regular work outs. I also add flax to combat inflammation. As Coal has aged it has become less of a problem. I don't know if that is common for everyone. He's now able to be out on pasture without a muzzle (our grass is not that good this year though; it is dry.) He seems more able to handle soy and is now on Nutrena Topline Empower Balance with a little of Renew Gold. He's not getting ridden regularly; he's on vacation. If we were trying to show we'd be back to dry lots, and weighing his feed and slow feeders and lots of walking. Right now he looks out of condition, but he's not fat. You need to be real careful with joint injections with a horse with high ACTH levels. Talk to your vet about this. I was going to have Coal's hocks done last year and decided against it because of his history with metabolic issues. I would not feed Foxy oats.