Just resurrecting this thread...
We've added yak chews to our repertoire and try different kong stuffing. He still hasn't figured out a way of getting at the food in there other than a slow lick.
This week his back teeth are really bothering him and he's started to rip apart his soft toys after chewing them with his molars. The toys we have seem to have fallen apart in minutes... we have one kong bear that has list both his ears, but is otherwise doing ok. Six other toys have been binned in the last couple of days.
Any ideas for tougher "teddy" toys?