Merck Manual

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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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