Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus Rope and TPR Ball Tug will keep your dog engaged and entertained with a variety of stimulating textures. The flexible TPR is soft on teeth and gums. Rope fibers help floss dog's teeth as they chew and play. This toy is perfect for interactive fetch, tug and gentle chew. Dogs see shades of blue and yellow. The K9 Fitness by Zeus collection was particularly designed with that in mind. The toys' blue and yellow colors can easily be located by your dog regardless of the environment they are playing in. Blue and Green. Tough rope and TPR construction. Perfect for playing fetch or tug with your dog.