My dogs love their kongs
In fact I've got seven of them all stuffed and ready to go (I'm dogsitting tonight

) to keep them quiet while I watch x Factor
I usually mix a bit of sandwich paste with Nature diet to make sticky stuff, put a bit of paste or Primula squirty cheese in the small hole, then a few biscuits in the bottom and a bit of cheese, leftover veg etc.
Then I fill up the rest with the skicky dog food mixture and push in a tripe stick or small chew. they love them and it keeps them quiet for ages
You can put any healthy leftovers in and make up your own recipes
Happy stuffing
Oh and I've also found that if you get some of those pre stuffed bones, you can scoop out the c**p that comes in them and put in your own mixture, the dogs love that too
XXX