The veggies I feed include carrots, sweet potatoes, squash, green beans, collards, kale, cabbage, lettuce (non-iceberg), broccoli, and turnip greens. Fruits I feed include melon (excepting watermelon), blueberries, blackberries, apples, bananas, pears, and strawberries.
I vary what goes into my veggie mix depending on what's on sale at the store - I make it up a week at a time.
I will also give my dogs oatmeal - one of my dogs does better with a bit of oatmeal or barley added into his diet.