Ok, my horse has always been a hardkeeper and I've helped rehab several skinny horses, so I can fatten a horse quite easily. But that's not my problem this time lol, the horse in question is a 7 on the BCS, he has gotten one scoop of Purina Ultium his whole life and is worked 5 days a week, and is still fat lol. Rolly polly fat! So I was thinking keep him on the same feed, but cut down to a half a scoop and add in a vitamin/mineral supplement? And a slow feeder net? I know he needs a diet, just don't have experience with putting a horse on a diet.