Sex, breed, use of flea-control products, number of years owned, indoor/outdoor status, and average house size were also unrelated to the risk of malignant lymphoma. Risk was slightly, but nonsignificantly elevated for cats fed moist, canned food as the main component of their diet. Long hair length, intact reproductive status, and living in a nonsuburban location were inversely associated with malig- nant lymphoma risk, although results were not statistically significant