I think it depends on the bite capabilities and the tenacity of the dog, and on how willing an owner is to engage in, or at least supervise, the play. I had a Lab pup that took the leg off a table when I wasn't looking. My current boy is a two-year-old Border Collie who could shred a tennis ball type toy in a few minutes if I'd let him, but is not an aggressive or tenacious chewer. These balls are great for him and he adores the squeak. As for what to do if they fall apart within hours or a few days, as opposed to being chewed apart, first ask the store to give you a refund. If they won't, then contact Kong.