The Kong is really a great invention. Our Mini Aussie loves him very much. One can cram him with everything and the dog has to do for quite a while, rauszubekommen everything. Since we Barfen, we were not sure at first what we can put in for, but as I said, anything is possible. We fill it mostly with his favorite sausage from animal food store, but he needs then about 15-20 minutes. Following simply rinse and the thing is as good as new. Our dog has it now for 6 months and it really seems to be virtually indestructible, even though we bought the Welpenvatiante. We give him the job as if we need to buy time, because he still has to learn to stay alone. That helps him a lot and he has fun. Great invention!