Feline gastrointestinal adenocarcinomas are the most common nonhematopoietic gastrointestinal tumors in cats. They are highly malignant tumors causing intestinal obstruction due to the annular, stenosing nature to their growth. Current literature is largely based on surveys of pathology records. Therefore, a retrospective study was conducted to evaluate clinical course and prognosis with surgical excision of the tumor. In published reports feline gastrointestinal adenocarcinoma represented 20-35% of gastrointestinal neoplasia in the cat; the average age was greater than ten years; and there was a greater incidence in Siamese. The small intestine accounted for 70% of cases. In this retrospective study, cats usually had a long history of non-specific gastrointestinal disease; weight loss and vomiting were the most common signs. Abdominal radiographs demonstrate intestinal obstruction, and an abdominal mass is often palpable. With intestinal resection and anastomosis, median survival time was 2.5 months (range: 0-24 months). Tubular adenocarcinomas may have a better prognosis than other histological types, especially if metastasis is not present at the time of surgery. A significant disease-free interval is possible in some cases.