Hello! Welcome back to CS! ^^
From taking a look at your
rares group though individually all of them are worth the 3 month rule. (aside from the sitting cat listed below).
The 3 month rule is trading a pet for another pet of the same species and rarity, but within 3 months of it's release.

This store pet that you have is worth a late 2010 rare though (:
I would suggest asking the
How much is this pet worth thread for valuing your pets in the future! c: