Canadian Brand. RDBK Bison Femurs are a great raw bone option for healthy dogs to chew on for dental health and enrichment. These ethically sourced, human-grade, and non-medicated bones are best suited for gentle chewers. Bison Femurs include variable amounts of meat, connective tissue, and generous amounts of marrow (fat). Large Bison Femurs are recommended for dogs between 26 - 60 pounds. Raw bones should not be cooked, and pets should be supervised when feeding any bone.