The invention provides methods and compositions for treating disorders using non-human animal Apolipoprotein A-I (ApoA-I) protein. The invention provides methods and compositions for treating disorders in animals, including humans, associated with dyslipidemia, including hyperlipidemia, hyperlipoproteinemia, hypertriglyceridemia, hypercholesterolemia, HDL deficiency, ApoA-I deficiency, cardiovascular disease, atherosclerosis, restenosis, and other disorders such as septic shock and viral infections.