@ Mnemosyne
If you need to refer to a spreadsheet of item-pet pairs, I have one made
here a few weeks ago when I decided to collect matching pets and items.
It has the release date of the item and the rarity and release date of the pet and all sorted into categories.
I made it so I can find which pets and items I had and needed to find since I used to put everything I don't own onto my wishlist which made it extremely hard for me to tell which pets were item based or not
Note it may be a bit laggy coz there's a lot of images. Ignore the first 3 tabs of the sheet (Wanted pets + Wanted items + Stats). It's for my own personal use to keep track of what pets and items I need for my own collection.
These are the relevant groups on cs:
item-pet pairs and
animal egg buddies that I personally collected so far.
Once I find the items that pairs up with the pets I currently have, I'm gonna start hunting down all those rares so I can reduce the number of items locked away on these pets and pair them together to join my collection