1.) Requires modification
2.) Delete the row from the database. It's in the prefix_links table
3.) Definitely needs a mod, not sure how hard it is
4.) Open your myadopts.php
find
PHP Code:
$query = "UPDATE {$prefix}owned_adoptables SET owner='SYSTEM' WHERE aid='{$id}'";
change it to
PHP Code:
$query = "DELETE FROM {$prefix}owned_adoptables WHERE aid='{$id}'";