Savory engagement: Nature Farm’s Beef Marrow bones provide dogs with an affinity for chewing with hours of entertainment. Marrow Bones are as delicious as they are beneficial. They give dogs an outlet for the medium-to-aggressive chewer with gnawing for hours, releasing beneficial endorphins and scraping plaque from your dog’s teeth. Dogs also benefit from a dense source of collagen, glucosamine, and calcium for musculoskeletal support. Single-ingredient treats made from 100% grass-fed Brazilian beef without artificial preservatives, synthetic fillers, or artificial additives. Best for large dogs.