Have you looked into ulcers? Candy was impossible to get weight on- she was getting 2 lbs of Rice Bran, 4 lbs of beet pulp, and I tried Cool Calories... and she was on free choice grass/Alfalfa hay in winter (now pasture). A friend recommended trying Dynamite Miracle Clay, I was very skeptical, but it worked. I have been feeding 1 ounce for 7 days and already see a difference. I am actually thinking I may have to start cutting back on the rice bran... she almost at a good weight! Dynamite Miracle Clay is supposed to help get rid of ulcers, sooth stomach and stuff. I was thinking she had ulcers for a couple months. I bought her almost a year ago, brought her to a horse facility 4 hours away from her home for 2 weeks on trial, and there she had very little turnout, then drove her home 4 hours away. When I got her she was obese- about a 7 on the scale, and in 6 days she dropped to a 5. She stopped there but this winter with some less than par hay at first, she dropped to a 3.5, then I found good hay, she went to a 4, and now she is about a 4.5, only taking a week. Anyways, this Dynamite stuff is a little nasty, it comes powdered, you soak it in a 1:1 ratio with water, and feed 1 oz once a day. It literally is mud. But it works! It is also pretty expensive, but my friend gets it for me half price, and if you are having trouble getting weight on after beet pulp, rice bran, pasture, and 24/7 hay, you may want to look into it! Anyways, that is my story.