if you abandon a pet what comes off it? Does their minion, tc, scrolls?

Yes, all of them you mentioned, as well all equipped potions (and pet equipped weapons before the armory existed).

thanks:)

You're welcome. To clarify, the items actually stay on the pet, and the person who adopts it gets all the items attached.

Ohhhhhhhhhhhhhh!! So they stay on the pet and not drop off into a Nether portal?

They stay on, but I would still remove the attached items unless transferring the pet to another friend. Besides, you might as well consider the items gone (to someone) when you pound a pet.

Unless it has been changed in the last two weeks. items in the TC poof. The minion and layout do not disappear though. No idea about the scrolls but if they are valuable why risk it?