Our Bully Stick Stuffed Collagen Sticks combine dogs’ two favorite flavors to create the ultimate chew full of indulgent enrichment. Two textures offer long-lasting enjoyment and tons of mental stimulation. They’re also packed with protein and collagen, offering dogs well-rounded skin, coat, joint, and muscle health. Formulated with all-natural, limited ingredients from grass-fed, free-range beef that’s free of chemicals, hormones, and antibiotics. Perfect for medium chewers.