A 6 year old Brown Swiss cow was admitted to Stange Memorial Clinic Dec. 29, 1947, with a history of being injured in the left flank while attempting to jump a fence. The left flank was extended anteriorly, laterally, and elevated dorsally. The enlarged flank indicated a herniation of abdominal viscera or an accumulation of exudate in the subcutaneous tissues. It was impossible to make a positive diagnosis so the cow was taken off feed for 2 days to facilitate a more accurate examination, and to prepare the patient for surgery if necessary. Examination was completed and the diagnosis of ventral abdominal hernia was made. Reduction by surgical methods was selected as the course of treatment.