What to do to a foundered horse?

To help your foundering horse, get immediate veterinary assistance. Medicines can be given to reduce inflammation and pain, and a good horseshoer or farrier can apply special blocks and shoes to ease pain and help the horse heal. In some instances, surgery is necessary. Remove the cause of the founder. ex: If a horse is foundering on grass, remove him from the grass and feed hay only. 100 years ago, foundering horses were tied to a tree next to a cold stream and made to stand in it, sometimes for days.