Lymphoma is a common canine neoplasm, accounting for approximately 9% of all canine tumors. Codie, a three year old male castrated Gordon Setter with a 1 1/2 year history of lymphocytic-plasmacytic enteritis and primary lymphangiectasia, presented to the Emergency Service at the Cornell University Hospital for Animals with a 1 day history of a painful abdomen and a three week history of soft stool. He was tachycardic (200 bpm), tachypneic, febrile (103.5 degrees F.), with a tense and hunched abdomen during the physical exam. An exploratory laparotomy revealed a focal ulceration in the jejunum which was resected and an end-to-end anastamosis was performed. Histopathology revealed that the ulceration was due to T-cell lymphoma. This paper will be a review of alimentary lymphoma in dogs.