Here’s what consumers have asked with answers from Kong staff and previous consumers.
Rubber toys last forever with exception of the puppy kongs, once the adult teeth come in you should put these away and purchase a larger one. My aussie ate the small end off at the age of 2 months. The ballistic material toys I wouldnt recommend if your dog is a chewer. They wont last minutes! My golden retrievers never tore up any toys (soft mouth) but the aussies my god they shred everything