Features Delicious treat for your dog Kangaroo tail bone Ideal for medium dogs Keeps them entertained Chewy bone Tasty dried meat still attached to bone Source of lean protein and vitamins The Blackdog Roo Tail is a delicious treat for your furry friend. About 15-20cm long and 4-6cm in diameter the roo tail is most suited for medium dogs and is guaranteed to keep them entertained. The Blackdog Roo Tail is a chewy bone surrounded by lean meat making it the perfect tasty treat. With a rich source of lean protein and vitamin packed bone marrow, roo tails contain less saturated fats than other bones so are ideal for dogs who can't stomach fatty foods well.