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Chronic polyneuritis in a Rottweiler.

A 2-year-old male Rottweiler was examined because of progressive weakness and muscular atrophy in the 4 limbs. Neurologically, the disease was characterized by hypoactive segmental reflexes without ataxia. Function of the cranial nerves was maintained. Electromyographic findings, nerve conduction velocity measurements, recordings of somatosensory-evoked potentials, and results of histologic examination of nerve and muscle biopsy specimens indicated a peripheral neuropathy. Rapid progression of the disease over a 4.5-month period was observed before the dog was euthanatized. Necropsy was performed, and the histopathologic findings confirmed peripheral neuropathy, which appeared to involve the peripheral myelin. An immune-mediated process was suspected.