Picky on food

There are many types of food which Jon does not like. He does not like vegetables - but he is forced to eat it if I have blended it and mixed with rice and kibbles. He also does not like bananas. However, I am surprised that Jon does not fancy a particular brand of kibbles. Maybe he doesn't like the texture of the kibble, which is a bit soft. His response yesterday was a real snub to this food. Yesterday, I was actually going to train Max with the kibble. When I called Max's name, Jon will - as usual - come over. Only this time, when Jon saw - and did not even sniff - the package I was holding, he just walked away and rested.