Fun and bouncy birthday tennis ball dog toy will make any dog's birthday a hit. Constructed from non-abrasive tennis ball fabric that will not wear down dog's teeth. All squeaker units are recessed in rubber and covered with tennis ball fabric for safety. KONG Air Dog Squeakair Birthday Balls will make any dog's birthday a hit. These colorful versions of our popular Medium Air Dog Squeakair Tennis Balls are imprinted with a Happy Birthday' logo and come three to a package. This high floating toy is perfect for all dogs that love to fetch.