Some pets do not have updated attribute stats. For example, I recently trained a Greater Lion. I used the morph to make it into an Elite Black Lion. The food selections do not show anything for grit, etc. It still shows ‘accuracy’ and ‘survival’ etc. I can’t train grit to get a better chance for the pet to get more armor. This is especially important for pets, which seem to take more damage/die quickly.
I wrote a thorough suggestion on pet diets back when they first changed the attributes system.
However, since writing that, I’ve learned a lot more about how diets are implemented in this game, and it is frightening. I think the devs never fixed diets because none of them wanted the nightmares that would come with it.
Maybe someone on staff sprung for a hazmat suit and they could fix diets with their bug-fixing focus, but I wouldn’t hold my breath - unless I am looking at diets, then holding my breath is mandatory to avoid nausea.