Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus Extra-Large Twist and Rope Tugger toy will keep your dog engaged and entertained with a variety of stimulating textures! Durable ballistic nylon weaves stretch and pull during play, while the tennis ball keeps pet intrigued. Rope fibers help floss dog's teeth as they chew and play. Perfect for interactive game of tug-of-war. 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.