Meningiomas are the most common intracranial tumors among cats and dogs; they are benign tumors that grow in a slow way under the dura mater, causing atrophy of adjacent nervous tissue. Its location includes the third ventricle, the meninges and retrobulbar region. The clinical signs evolute in a slow way and the animals can present pendent head, ataxy, face nervous paralysis, abnormalities in walking and in postural reactions, convulsions and blindness. The radiographs are usually normal, but the brain angiography or the computed tomography can show lesion. The aims of the treatment are tumor surgical excision associated with radiotherapy and animal symptomatic treatment. A Collie male dog about 5 years old and weighting 23kg was assisted in the Veterinarian Hospital of Universidade Luterana do Brasil, presenting neurologic clinical signs. According to the owner, the animal was blind since he was acquired about two years ago, and, at about one month ago, the animal started to present convulsions and alterations in behavior with compulsive walking, mainly the left side. Another veterinarian had already prescribed diazepam and phenobarbital and the animal has been sent to the hospital. In the general clinical examination, it was observed that the dog was depressed, with rectal temperature about 38,6°C, roseate mucous membrane, 140 heart beats per minute, pulmonary auscultation, lymph nodes and abdominal palpitation without alterations. In the specific examination, it was observed head inclination towards the left side, ataxy and compulsive walking. There was face asymmetry, absence of pupillary light response, palpebral reflex diminished, anisocoria and palpebral ptosis on left side. Exams such as hemogram, total plasmatic proteins, platelet were made as well as creatinine dosage, alanine aminotransferase and serum alkaline phosphatase, which the results were in the normality; besides the head computed tomography, which evidenced a tumoral mass measuring 3cm of diameter x 3,5cm of length in the olfactory bulb region and optical chiasma on the left side. The animal stayed hospitalized during 4 days receiving phenobarbital and diazepam, besides all nursing care, when euthanasia was opted. The macroscopic examination evidenced a tumoral mass posterior to the olfactory-bulbo presenting firm consistence, expansive growth, causing reactive hyperostosis. The microscopic examination evidenced a mass constituted by fusiform interlaced cells proliferation, forming circling laminations, with calcified material in the centre, which confirms the meningioma.