For the person who asked about a horse who was not eating or drinking?

I found the article about a horse that did not eat or drink for a week! November 20ll issue of the Equus magazine, page 21 Renal tubular acidosis;; A rare condition with only a few documented cases, Blood must be tested within 20 min of being drawn. Horse stayed at the university clinic for a few days was given sodium bicarbonate in intervenous soultuion with electrolytes, fluids and glucose to compensate for4 the meals she had missed for so long. Within the first 24 hours she began to improve. She is given baking soda daily as a preventative measure.

So It might hurt to give your horse a sprinkle of BS over grain.