KONG AirDog Knobby Ball combines two classic dog toys�the tennis ball and the squeaker�to create the perfect fetch toy in a unique shape that bounces unpredictably for tons of healthy instinct-satisfying rebound action. Dual materials ensure long-lasting fetching fun while the non-abrasive, high-quality material is gentler on teeth and gums. Squeaker keeps the action going for tons of healthy exercise.