Vegetables give your pup vitamins, fiber, and some canine crunch. Try serving these raw veggies whole, grated or finely chopped: carrot, cucumber, zucchini, lettuce, bell peppers, corn (cut off the cob), and celery. Or steam these favorites: green beans, broccoli, asparagus, cauliflower, and hard winter squash. Skip avocado, which can upset their stomach. Don’t give any vegetable or other human food that seems to cause tummy trouble.