Originally Posted by bubba13
Agree with others' assessments. Too thin now, perfect before. I would deworm him. And free choice quality hay is better than grain for putting on weight. Adding a fat supplement to his feed can also help, but he may not need it.
QUALITY hay is key. If the horse is not eating decent hay - it's just filler. Takes longer to pass through the body (hay belly) and no nutrition (weight loss in other areas).
And yes worm him! You can worm again with the herd.