The simplest but best Kong

Have tens of different Kau / toys tried and I can say: the Kong is so far the best.
Just a piece Klettersein push through (my Terriermix had after 15 minutes all of Tails "Kong Tails" by) and tie a knot. Finish the game pass for weeks!
As Leckerlie to liverwurst, cheese, etc. are better because the hard things either fall out immediately or not rauszubekommen are (-> frustrated dog :)