Inflammation of the brain and meninges is a common cause of neurologic
dysfunction in dogs and cats. A wide range of infectious agents has b
een demonstrated to cause encephalitis an meningitis, although there a
re many inflammatory conditions for which an etiology has not been fou
nd. Analysis of cerebrospinal fluid is the most useful diagnostic lest
to identify central nervous system inflammation. This article discuss
es the common causes of encephalitis and meningitis in dogs and cats,
focusing on clinical presentation, diagnostic findings, treatment moda
lities, and prognosis.