Snook's Large GMO-Free Sweet Potato Dog Chew These products are wonderful for dogs, rabbits, birds, rodents and other small animals. GMO-Free Sweet Potato Chews are made with GMO-Free Sweet Potato, Vitamin E and are on a Chemical Free Hemp Rope. They are easy on the digestive system and are excellent for your pet&#39;s teeth and gums. They were tested on humans and are made with human grade ingredients.