My Baron was neutered in May @ 17 months old. He still will mark occassionally. I have always worn belly bands on him since I got him @ 6 months and he was already marking. He was diagnosed with Pancreatitis in July and I can't wear the belly bands on him anymore. It puts too much pressure on his belly and they hurt him. So, I have to watch him like a hawk and have puppy pads all around the house. Good-Luck with your little marker...