A 8-year-old intact female Siamese cat with chronic vomiting was referred to the Veterinary Teaching Hospital of Chungnam National University. The cat was diagnosed as lymphocytic-plasmacytic enteritis by complete blood count, blood chemistry, radiography, ultrasonography and histopathologic examination following small intestine biopsy. The cat show good prognosis to date after continuous hypoallergenic diet providing and low-dose prednisolone therapy.