Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus Double Tug Ball toy will keep your dog engaged and entertained with a variety of stimulating textures. The flexible TPR ball is soft on teeth and gums. The inner tennis ball will drive dogs wild and entice play. Double rope handles are ideal for an interactive game of fetch or tug. Additionally, 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.