A 5-year-old Toggenburg doe was examined because of wasting, decreased milk production, and progressive abdominal distention. Abdominal percussion disclosed a prominent fluid wave crossing the abdomen. Physical examination revealed no cardiac abnormalities. Abdominal paracentesis yielded 21 L of modified transudate (protein concentration, 3.6 g/dl; sp gr 1.013; 0.6 X 10(3) nucleated cells/ml) over a 2-hour period. During surgical exploration of the abdomen, dilated loops of intestine covered with 1- to 3-mm firm masses and a larger mass associated with extensive adhesions were found. At necropsy, an annular tumor causing partial obstruction was found in the distal portion of the ileum. The histopathologic diagnosis was adenocarcinoma.