Oh yeah! At eight months, he's basically turned into the doggy version of a teenager.
Maybe try taking him for walks where he can smell new smells and mark there instead of on your couch.
A belly band is a piece of cloth that holds a sanitary napkin to catch their urine when they're not supposed to be going potty. Yorkie Haven Rescue sells them on their website,
www.yorkiehavenboutique.com , as do a few other YT vendors.