Tennis balls only come in one shape, but your dog loves to play in lots of different ways. The KONG AirDog Donut has the soft felt of a tennis ball but the unique shape of a donut. Plus, the non-abrasive material won't wear on your dog's teeth. The squeaker inside the toy will keep your dog interested for hours. You'll love watching your dog play with the KONG AirDog Donut almost as much as he loves playing with it.