KONG%20AirDog%20Knobby%20Ball%20combines%20two%20classic%20dog%20toys%20–%20the%20tennis%20ball%20and%20the%20squeaker%20–%20to%20create%20the%20perfect%20fetch%20toy%20in%20a%20unique%20shape%20that%20bounces%20unpredictably%20for%20tons%20of%20healthy%20instinct-satisfying%20rebound%20action.%20Dual%20materials%20ensure%20long-lasting%20fetching%20fun%20while%20the%20non-abrasive%2C%20high-quality%20material%20is%20gentler%20on%20teeth%20and%20gums.%20Squeaker%20keeps%20the%20action%20going%20for%20tons%20of%20healthy%20exercise.FeaturesSqueaker%20extends%20engagementDual%20material%20for%20added%20toughnessNon-abrasive%20felt%20gentle%20on%20teeth