BARKSTERS SWEET POTATO & BEEF. Enjoy crunchy, delicious, guilt-free treat-giving with Barksters low fat, 12 calorie treats. Why Sweet Potato? Sweet potatoes contain high levels of Beta-carotene, an antioxidant that supports cellular health and eyesight. Sweet potatoes are also a good source of several essential vitamins and minerals including Vitamins A and C, and Potassium. Why Beef? Beef is an excellent source of lean protein. It adds the meat flavor that dogs crave and makes this healthy treat even more satisfying.