life cycle: 1. Eggs laid in SI - pass out of body in waste/vomit 2. larvae develop within the egg after 2 weeks, larvae eggs attach to fur and are ingested while grooming 3. eggs hatch inside the stomach and travel to the SI, development continues in the liver, into the blood vessels, into the heart, into the lungs, coughed up then re swallowed 4. makes it's way back to the SI, lays more eggs