Mice build homes near sources of food because they eat 15 to 20 times per day. House mice primarily feed on plants, but they will also eat meat and dairy products. Even a small amount of mouse urine can trigger allergies, and mice spread disease through bite wounds and by contaminating food and water with their waste. Mice also spread disease from parasites, such as ticks, fleas and mites. These parasites bite the infected mouse and then spread the disease by biting humans.