My two like carrots, peas (fresh and frozen too), lettuce, apples, pears, peaches, mango, berries like strawberries and blueberries, cucumbers, green peppers, zucchini, sweet potatoes, bananas, spinach...oh, just about anything you can think of
Remember to peel apples & bananas, and to take the seeds out of any fruits like apples, pears, and the pits out of peaches and other stone fruits. Grapes, raisins, onions, garlic, and macadamina nuts can be toxic to dogs, so make sure you're not feeding those things.
Happy snacking!