Polycythemia vera has been reported as a known condition in cats as early as 1966. This condition manifests as an increased mass in red blood cells and elevated hematocrit and is defined as an idiopathic chronic myeloproliferative disorder. The patient described in this paper presented with hyperemic gums and pinna and an acute onset of progressive ataxia and lethargy. Several possible underlying primary conditions such as cardiac disease and renal malignancy were excluded by running basic blood work and radiographic imaging. Initial blood work revealed a significantly elevated packed cell volume (88%). After diagnosis, treatment with phlebotomy and chemotherapy lead to a reduction in hematocrit and elimination of neurologic signs. This case study represents the diagnosis and successful management of this disease in a private practice setting. Polycythemia vera is relatively uncommon in dogs and cats, but should still be considered in cases of neurologic disorders, especially with the presence of bright red ears, paws, or gums.
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