I made a certain toy high value which only comes out when I play with Ash (now nearly 9 months)
I also don’t feed Ash’s food all from a bowl (as that is free food) she has a treat ball and flying saucer that I put her food in and she has to work for it, also each meal I start with a good handful and do training with her before she gets the ball and flying saucer
I love kongs too - some ideas for kongs below
A little kibble to stuff the hole, a squirt of soft cheese and a shape biscuit to make it harder to get to the delicious cheese
Same as above but with a little hotdog sausage
Tuna in some natural yoghurt- make sure to put a bit of kibble in the bottom first so the tuna mix doesn’t leak out - then freeze it
There are loads you can do with a Kong without buying the Kong fillers from the shop
Chews we have tried, yak, antler, nylabone and only the yak does madam take any interest in