Barking Buddha’s Longlastics 36-inch Canes are the newest collagen chews for power chewers. They are the perfect size for Medium to XL dogs that are strong to power chewers but still enjoy a long-lasting 100 percent grass-fed beef chew. Longlastics are 99.4 percent digestible, 94.8 percent protein and are low in fat. These long-lasting chews benefit a dog’s skin and coat while also improving joint health. They are single-ingredient, additive-free, chemical-free and preservative-free. The brand does not smoke or add smoky juice to its chews.