Regular exercise keeps dogs happy and healthy. The K9 Fitness by Zeus tennis ball twist tug 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. Great for interactive fetch and tug. Chasing tennis balls comes naturally to most dogs. The K9 Fitness carefully selected colored ball and rope toy makes it easier for them to see. The bright colors stand out better against any background.