Just bought this, after so many online reviews saying you should have one for your new dog.
Well after trying out 2 in the store (one my husband couldn't even move it to max) we picked the other one. But our thumbs are bruised trying to remove the cylinder.
We have followed the insturctions, gone online (just the same stuff) and there is no way we can remove this cylinder.
Why when designing this, they couldn't have a line on the cube "remove" here?
I have tried doing it with towels - everything and even things the instructions don't say.
So it's going back, my husband refusing to keep something so badly engineered in the first place (it shouldn't make your fingers bruised).
Nice idea but if you can't open it to wash it - not practical

Also having it in a non noisy rubber kong material would be better.