Narcolepsy in a long-haired dachshund.

Narcolepsy was diagnosed in a three-month old, longhaired Dachshund presented with a history of sudden onset of episodes of complete collapse. Littermates or immediate ancestors were not affected. Numerous daily cataplectic attacks as well as excessive sleepiness were the main clinical features. The dog did not respond to treatment with methylphenidate and imipramine. The clinical signs of the disease disappeared after treatment with dexamphetamine. This report describes a case presentation, findings of cerebrospinal fluid assay for catecholamines after various treatment regimens and the response of the patient to treatment.