Ask the Nutritionist: Dr. Getty's Forum for Equine Nutrition
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Here you will find more than 6 years of questions and my answers. It is searchable and offers a great deal of information.
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All the best,
Dr. Getty
Hello Tessa,
Most retired racing horses have ulcers, and this is the first thing I would approach. I recommend taking him off of the electrolyte supplement. He does not need it unless you are exercising him extensively. What he needs is salt -- plain, white salt (iodized if he is not getting iodine from another source).
Offer him two things -- a plain white salt block, plus, granulated table salt (that you buy in the grocery store), offered in a bucket, free choice. He is more likely to dab his tongue on the granulated salt since many horses do not adequately lick a salt block.
Make sure his water is clean with no additives. And then, in a separate water container, offer him some flavoring agent. Start with apple cider vinegar -- about 1/2 cup in a 5 gallon water bucket. Most horses like it. If he doesn't, then consider a small amount of apple juice.
Be sure he is getting all the hay he wants -- that he never runs out. An empty stomach will leave it filled with acid (since his stomach is constantly secreting acid, even when empty). Chewing is the best thing for his digestive system, along with a steady supply of forage to prevent colic.
And if your budget will allow, consider giving him AmiQuell to soothe his digestive lining.
Keep me posted!
All the best,
Dr. Getty 
Author of Feed Your Horse Like A Horse
HELP!
Tessa
Where are you from? Bayfield, CO