A 10-month-old dog was presented with clinical signs of fever, lethargy, inappetence, and cardiac arrhythmias. Computed tomography scan and cerebrospinal fluid analysis supported the diagnosis of steroid-responsive meningitis-arteritis. Echocardiography, electrocardiogram, and elevated serum troponin I supported a diagnosis of myocarditis. The arrhythmias resolved during treatment of the primary neurological disease, and they were considered as secondary to the meningitis.

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