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Miscellaneous Causes of Diarrhea in Horses

By

Allison J. Stewart

, BVSC (Hons), MS, DACVIM-LA, DACVECC, The University of Queensland

Last full review/revision Sep 2013 | Content last modified Sep 2013

Other causes of diarrhea or semiformed to watery feces in horses include grain overload, thromboembolic disease of the colon, peritonitis, antibiotic treatment, renal failure, numerous toxicoses (eg, blister beetles [cantharidin], salt poisoning, slaframine, amitraz, propylene glycol, phosphorus, selenium, nicotine, reserpine, arsenic, mercury, monensin, organophosphates, oleander, Japanese yew, castor bean, avocado, thorn apple, potatoes, heath, algae, acorn or oak, Hypericum, corn cockle, mycotoxicoses, horse tail [scouring rush]), hyperlipidosis, and resolving impaction of the large intestine after treatment with oral cathartics such as magnesium sulfate.

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A 7-year-old gelding undergoes sedation for a standing surgery to clean and close a wound on the left forelimb. He is returned to his stall afterward, and several hours later he is observed to have nasal discharge containing feed material. He is also drooling, grinding his teeth, and intermittently coughing or retching. Which of the following conditions is most likely causing these clinical signs?
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