XL size for big dogs! Keeps big dogs wagging. Perfect for furry family members over 100 pounds. These are the most durable yak chews for aggressive chewers and extra-large breeds such as Labs, Collies, Retrievers, as well as giant breeds, including Great Danes and Irish Wolfhounds! Removes plaque and tarter build-up and improves dental hygiene. Lasts for approximately 15 chews.