My 2 pit bull pups are getting bigger and are now too strong for any toys I give them. Though as I've done with my current 5 older dogs and just give them Kongs, the puppies are very disinterested. They don't like to play with the kongs at all, maybe this is because they cant destroy them as easily onder: ? But anyway I dont know what to give them that will last and that they will get a kick out of playing with. Any ideas or thoughts?