The Milk-Bone Wonder Bones Triple Layers Long-Lasting Dog Treats are made with real USA bacon and are perfect for dogs of all sizes. These treats are designed to be chewed and provide the dog with a healthy dose of protein and calcium. The Milk-Bone Wonder Bones Triple Layers Long-Lasting Dog Treats are also easy on the dog’s teeth and can last up to 30 days in the dog’s stomach without any harmful digestion issues.