Hi there

So I have ventured here from a different site and I have a question!

Is food just something your pet eats, or is there some sort of collection for the foods you have ate?

It's a little bit of both! Feeding your pet fills their hunger bar so they can battle, but you can also check what foods your pet has eaten by going to the top menu bar and choosing Personal -> Pets -> [pet name] -> Foods this pet has eaten. There are achievements for feeding pets a certain number or certain types of foods as well.