Great for training Better for your dogs teeth Colors may vary depending on color of leather available Drive building in adult dogs is always done with the smallest tug. These tug have one handle or two handles. It can be moved very, very quickly. The goal of drive building with a small tug is to move it around your legs and body at a speed that the dog can not get at it. Moving them around in short quick movements forces the dog to move quickly if he has the drive to catch it - when the dog misses the tug it builds frustration and frustration builds drive. Using the longer tugs does not work because the dogs are too quick. It's too easy for them to grab a long tube or the second handle on these longer tugs. So it's much easier to play "keep away" with this smaller tug.