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Find information on animal health topics, written for the veterinary professional.

Miscellaneous Causes of Diarrhea in Horses

By Allison J. Stewart, BVSC (Hons), MS, DACVIM-LA, DACVECC, Department of Clinical Sciences, John Thomas Vaughan Large Animal Teaching Hospital, College of Veterinary Medicine, Auburn University

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.