Both wild mice and pet mice prefer eating oats, grains, wheat and corn, according to the What Mice Eat website. Mice also enjoy eating a variety of fruits and vegetables such as apples, broccoli and celery.
Pet mice enjoy eating pellet food supplemented with grains such as barley. Pet mice also enjoy eating regular food such as hard-boiled eggs, small amounts of cooked pasta and pieces of stale bread, according to Pawnation. Certain types of mice, such as wild mice, are omnivores and are less particular about food. Wild mice eat everything from seeds and crops to dead animals and rotting garbage.