Oh boy, I'm so frustrated. JoJo stayed at my parents for a few days while I was away on a trip (he didn't pee in their house once), and since coming back home he's started marking nearly everything in the house! My couch, desk, doors, walls...just about everywhere. I'll take him out and he'll go, but I swear he holds some back just to mark inside the house when we come back in! Crate training isn't working, taking him out frequently isn't working either. I'm completely at a loss here.
Anyone have any suggestions? Also, he's 10 months old and is getting neutered in 3 weeks. Will neutering help stop this behavior, or is it too late at his age?