My dog has always been good in letting us know when he has to pee, but lately he has been peeing on bags and boxes. I just want to know what can I do to get him to stop. I don't want to het him neutered.

First and foremost you'll need to take him to the vet to make sure this isn't a medical issue. If he has a clean bill of health from the vet you need to look at environment. Any major changes in the home, a new dog, a new cat, a new child, a new boyfriend/girlfriend, moving to a new home, new furniture? Anything new at all?

Also, how old is the dog and how long have you had him?