Even if it's just one little drop, they'll try to squeeze it out to mark. In my opinion, it's not that hard of a habit to break. You're doing wel! You caught him in the act, and corrected him, and he has the belly band as backup. Either way he doesn't get to "win" and mark up your house.
Having had a bad marker (Kaji would have peed on everything in the apt
) I know it's possible to eradicate that behavior. But, at the same time, let them be who they are and that is little boy dogs that mark. To this day, I praise Kaji for marking outside on our walks, and he doesn't bother to mark inside. It only took a few months (and a neuter
) for him to get the message.