A condition in dogs caused by vitamin B3 (niacin) deficiency, causing the tongue to darken and swell.
From 'black' + 'tongue,' a descriptive medical term identifying the visible symptom of pellagra in canines, first documented in veterinary medicine in the early 1900s.
When scientists discovered that blacktongue in dogs was cured by niacin, it helped them understand that humans suffered from the same deficiency disease called pellagra—a major nutritional medicine breakthrough!
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