We feed ours red and green leaf lettuce, some romaine, mixed peppers, cucumber, carrots, and spring mix. For treats they get apple slices, grapes, we do cabbage once in a while.
My two get red and green leaf lettuce, radicchio, green peppers, baby carrots and grape tomatoes. Neither liked zucchini, I only give red peppers once in a while because they have too much sugar. Once in a while they get an apple slice.