Goldiefur, our pug was neutered at 5 months. He marks everywhere. He'll spend 30 minutes outside doing nothing but marking. Half the time nothing comes out. He's over 5 years old now and this is how he's done it his entire life, since before he was neutered. He even marks inside. If I go upstairs and the other dogs follow me and he doesn't, a lot of times he'll mark on the bottom step. He is the most aggressive out of all our dogs even though he's a little guy.
Meanwhile our GSD is nearly 3 and intact. He doesn't roam, and doesn't mark except for a few certain trees and bushes in our yard. He's not marking every 10 feet when we are on a walk. He didn't even lift his leg till he was 10 months old. He's got some minor dog aggression issues but he's way better than he used to be. He can now go off leash for an entire obedience session without any problem, where a year ago, he couldn't. He wants to be the boss and he lets the other dogs know it as soon as he walks onto the field by how he carries himself. He doesn't fight or go after any other dogs. The only time we've had a problem is when another dog gets loose and runs up to him and gets in his face. At that point, he will let them know they have overstepped their bounds.
I'm not telling anyone to neuter or not neuter their pets, but hearing the same stories over and over about what it will cure gets old. How can people do activities where dogs are not neutered- agility, show ring, etc, where there are many intact dogs around and there not be problems? Because it's all about training.