So being back and everything I noticed some things that could be helpful not only to me but everyone else. Ignore this if these have been suggested rip.
-A checkmark symbol that shows up next to any pets you already own;
I know that when I'm trading I'll see a pet I like and go for it, but after trading I realize I already had that pet! It's kinda hard to keep track of which ones you have and which you dont sometimes. So maybe a trade feature or just an overall site feature that lets you see which pets you already have. Like a checkmark next to their name/date that appears or somewhere on the pets profile.
----------
-Add to wishlist button;
I think there really needs to be a button on a pets profile that adds it to your wishlist, it gets annoying seeing a pet and having to go all the way to the archives and sorting through everything to find it. It'd just be so much easier to go to said pets profile and add it to your wishlist.
---
These are just random ideas off the top of my head I get when I'm playing, they're just things that I think will make the game easier and more enjoyable to play.