HS- Got Any knowledge about Supplements?

Have you had the teeth checked on the thin horses? If not have them checked especially if they are slobbering their gain all over. I think you are probably spending too much money on supplements that really isn't necessary. For the thin horses add vegetable oil to their grain. Start with 1/4 cup per feeding and go up to as much as 1 cup 2x a day over the course of a few weeks. Have you actually had the thyroid checked on Po? If not you might be wasting money on an unnecessary supplement. Many ponies seem to keep very easily because they often have ancestors which originated on islands with poor natural feed sources. They will stay in good shape on gr hay and/or limited pasture. Too rich of hay or pasture can cause them to founder. Have the vet take a blood sample on Po to see if he actually has a thyroid problem and take it from there. Make sure all of your horses have a trace mineral salt block with selenium available and they will do a pretty good job of getting what they need. The vegetable oil also helps with the coat and I really doubt your 7 year old needs a joint supplement. If anything your creaky old horses might do good with some glucosamine. Have your 6 year old vet checked when you get the other horses teeth checked. A 6 year old should not be going lame unless you are not working him often enough and then overworking him when you do work him.