I have two horses that could use a little Weight Watchers, but one in particular worried me when he suddenly packed on a couple of hundred pounds after a change in the herd structure. I cut his grain to a handful of the lowest-cal stuff I could find, and I bought a slow-feed hay net. I had to try several before I found one slow enough to keep him busy all night when he was in his stall (which unfortunately isn’t often) with just two or three flakes of hay. Muzzles haven’t worked for my guys. One has small ears and no way I attach the muzzle keeps it on when he wants it off. The other spends an hour working on getting it off, meanwhile rubbing his face raw. But that’s just my horses. I’ve seen others have great results.
I hope you find a successful solution. This is a bear of a problem!
Horses In the Yard