100% natural. Grain and gluten free. Suitable for puppies over 12 weeks. High in protein. No preservatives. Healthy and nutritious. Natural udder sticks contain nothing but pure udder with no additives or extras. Perfect for satisfying their natural chewing instinct, these treats are not only delicious but they’re great for strengthening teeth and gums too. Ideal for training your dog or as a guilt-free snack.