Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus Retriever crinkle Tug toy will keep your dog engaged and entertained with a variety of stimulating textures. The flexible TPR retriever is soft on teeth and gums. Inner ballistic nylon core with crinkle sounds entice play. The Rope Tug toy is ideal for an interactive game of fetch. 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.