Animals' health improves when they receive a consistent source of fat, protein, and carbohydrates—and that's not how human diets generally work. Rubin recommends a high-quality natural food, such as the Wellness and Holistic Selectbrands—other good options include Organix, a high-quality pet-food line that's certified organic, and Annamaet, which is also a high-quality, made-in-the-USA dog food.
Be sure to feed your dog appropriate portions of a high-quality food twice a day, as opposed to letting food sit out in a bowl all day. And forget about doling out excess treats—the majority of America's pets are already obese. "Show love with petting and attention rather than feeding them," says Rubin. Healthy dog treats include baby carrots, cauliflower, cut-up apple pieces, lettuce, pear pieces, and even watermelon—just don't give them the seeds, and avoid produce that has a stringy texture—it could cause digestive distress and get stuck in their teeth. Also, never feed dogs grapes or raisins because they often cause canine renal failure, and avocado pits are also extremely toxic to dogs. (Keep these 10 toxic plants away from your pets.)