An 11-year-old, 3.3 kg, male Maltese dog was referred to Veterinary Teaching Hospital of Konkuk University because of diarrhea and severe anemia. Abnormal physical examination findings included left submandibular lymph node enlargement, pale mucous membrane, cataract, and bloody diarrhea. Results of hematologic examination revealed a marked lymphocytosis resulting in leukocytosis and the markedly increased numbers of small, well-differentiated lymphocytes in the peripheral blood. Serum biochemical abnormalities consisted of elevated AST and ALP, hyperphosphatemia, hypoglycemia, and hypoalbuminemia.

Three aged dogs, all over 15 years old, with multiple seizure events and various neurologic signs such as head turn and ataxia were brought to the referring hospital. Two cases were tentatively diagnosed with intracranial meningioma based on magnetic resonance imaging, and one case was histopathologically confirmed as meningioma at necropsy. All dogs improved after initiation of pulsed high-dose hydroxyurea (HU) treatment. Clinical sign relapses were managed by repeating high-dose HU without obvious side effects. Pulsed high-dose HU can be applied when clinical signs are refractory to the traditionally recommended dosage for intracranial meningioma in dogs.