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Horses are unable to burp, vomit, or breathe through their mouths. Their digestive system is way in one direction. The drawback is, it can cause colic. 1).
The peak power output of the horse could be as high as ~15hp; 1 hp (horsepower) is a rate of sustained activity of horse in typical works in agriculture or powering industrial machines 2).
Adult stallions have up to 44 permanent teeth in their mouth at once Mares usually have between 36 and 40 teeth.3).
Old Billy, born in England, in 1760 was the longest-living horse, verified to be 62 at the day of his death. He lived as a barge horse that pulled barges up and down canals 4).