Idiopathic hepatic lipidosis (IHL) of cats is a disease causing severe liver dysfunction; cats afflicted with the disease have a guarded to poor prognosis for recovery. Hepatic lipidosis or fatty liver also occurs in most domestic species including the dog, the chicken, and ruminants. A variety of etiologies for hepatic lipidosis are known and may be classified as either metabolic, nutritional, toxic or hypoxic conditions. The cause of IHL is unknown.