I haven’t had a very hard keeper mini so far, but I ‘d say to maybe get his teeth checked. One of my mares wouldn’t gain weight ( although she didn’t loose much) because her teeth needed to be floated, though it was not dramatic… once the vet had it fixed, she was good for the winter. maybe you already checked that, it’s just an idea I had.
I did have another horse that was a terrible hard keeper, due to his age… and the fact that he was loosing his teeth ( i mean, he was 30 years old) though not a mini. Some things that worked well was a soaked beet pulp mush, with 2 spoons of vegetable oil… I’d give him that with soaked alfafa/ timothy hay pellets… but that may not be necessary if Stormy already has enough hay…
Definitely ask your vet or horse nutritionist his/ her opinion though for quantities etc. before you try it, go gradual to avoid digestive problems.
And ditto to what the others said, ration balancer is like the basic thing after hay…
Maybe I’m off here, but for some reason, whenever I gave my horses ( minis) grain that was sugar high and starchy, they would have more energy and loose weight from being too active and burn too many calories in cold weather , which is why I just give ration balancer… But then it all depends on the situation.
Lastly if possible I’d definitely have a horse nutritionist come and determine what’s going on, and test your hay, recommend portions etc. My feed store has one and she comes every year to test my hay and adjust my horse’s diet for their current needs… one less worry for me.
Hope it helps
