I own a 17h TB cross that I show in children's jumpers. Right now, he is getting 4 qts of whole oats and 4 qts of sweet feed twice a day. He also has unlimited access to hay and salt in his pasture. During the winter, I kept him in a paddock with a large hay bale, but now that the spring grass is out, I have reintroduced him to the big pasture. He is not easy to keep weight on and I had him on weight supplements over the winter, but since the grass is back, I figured I'd take him off. He was moderately skinny when I bought him 9 months ago, and he has gained a ton of weight. Still, I'm not so sure about if he is at a healthy weight or not. Really, depending on what angle you are looking at him from, he looks different. I went out and took some pictures today, what is y'alls opinion, and also what can I do to get him to gain more weight?
Also, here's a recent video of him being ridden: