To have some sort of search bar so you can easily look up an item to see whether or not it has it in it's collection.

Would make it a bit easier to see if I've missed something or not, since I've made some mistakes with the Subetalodge lists. sheepish laugh

This actually sort of exists already! http://subeta.net/isearch.php

If you search for a specific item, it will tell you if any of your pets have eaten it.

Also, if you go to the pet's page for foods they've eaten, you can press "Ctrl+F" to look for individual food items as well.