Our puppy Bentley will be a year old next weekend. Over the last couple of weeks he has started to mark things. I first started noticing it when our other dog is urinating he will stand right behind him and wait until he's done then walk right over and urinate on it. I do not allow him to stand right behind him but he will still go over and pee when he's done. I can't always prevent that as they go out potty a lot without us. That is not really bothering me, but he has started to mark things in the garage, on the patio, porch posts our car tires ect. The garage is NOT a place for sure we want him doing this. How do we stop this behavior? We do not want to have him neutered yet as others have suggested to us.