I looked up a name I'd like, but it's taken. At the top, it says "This pet belongs to an inactive account! You can create a new pet, or change a pet name to this name!" so how do you do that? :) thanks!

you can either make a new pet and use that name, or you can change one of your existing pets' names by choosing the "change name" option on that pet's dropdown menu on the pets page (this option costs 500 CSC).

Oops, late

If you like the name you can just go adopt a pet and name them that very name you liked. It'll be your pet's name from now on. To change an already existing pet's name of yours to the name you're looking at you can use the name change option. By going to your pet's page (where they all are listed) clicking the drop down menu and selecting "Change name." Be warned, changing the name on an existing pet will cost you csc (cash shop credits)

Thanks for the replies! I just tried all of those suggestions and it's telling me "That pet already exists!" well shucks! I wanted that name!!! :(