An umbilical hernia results from a defect of normal abdominal wall closure in the area surrounding the umbilical stalk. Umbilical hernias in calves are generally considered to involve genetic factors, although the mode of inheritance is debated. Umbilical infection is frequently associated with the hernial defect. Ethical considerations of treating umbilical hernias in breeding animals should be considered. Visual examination, manual palpation and ultrasonography are methods used to determine the differential diagnosis for a calf with an umbilical mass. Differential diagnoses for an umbilical mass include: simple umbilical hernias, umbilical abscess, stalk abscess, urachal cyst, or an enlarged umbilical stump. Common treatment methods for uncomplicated hernias include use of clips, elastrator bands, belly bandages, and manual or chemical irritation to encourage hernial closure. For larger defects or those involving infection, open herniorrhaphy is recommended. Surgical complications include: abscess, peritonitis, dehiscence, and seromas or hematomas.