Merck Manual

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Esophageal obstruction, feed at nares, horse
esophageal-obstruction-feed-at-nares-horse-hawkins-sized
Esophageal obstruction, feed at nares, horse

    Photograph of the muzzle of a horse with esophageal obstruction (choke). Note the characteristic green nasal discharge.

Courtesy of Dr. Jan Hawkins, Purdue University.