For carnivores, large raw meaty bones are a primary source of calcium. Other benefits include natural oral hygiene and supplemental nutrition through consumption of bone marrow. Canines, wild and domesticated, have always chewed on bones. Rumors suggesting that bones are dangerous, however, do have merit. Cooked bones, which can splinter dangerously, should always be avoided. Moreover, the most commonly sold bones are the ends of cow femurs. Round and marrow-rich, these clean-looking bones are extremely hard and frequently chip dogs’ teeth. If you like giving your dog this type of bone, do limit their chewing.