The bone-shaped, plant-based Best Friend Snacks Calcium snacks with chicken and duck fillet are perfect for all adult dogs. The texture and high calcium content of the snacks help reduce tartar and prevent bad breath. These completely grain and milk-free snacks are also an excellent option for sensitive dogs. The source of calcium is calcium carbonate. The compact, resealable pack is easy to take along on a trip, for example, and it keeps the treats tasty.