My 4 month old puppy submissively urinates whenever he gets excited. I thought with training & confidence this would go away, should I give him treats every time he doesn’t pee?

My puppy is a boxer mix. He is about 4 months old and is very playful and friendly with everyone. The problem is excitement/submissive urination. He will run up to someone with his tail wagging, but when they pet him he pees.

I have raised 2 dogs now by a Koehler method with positive reinforcement. They were great dogs and eventually did not need to be on a leash to continuously heel and immediately sit when I stopped walking. Neither of those dogs had a urination problem though.

He is young but has already mastered COME, SIT, LAY, and SPEAK. I assumed with training he would build confidence, but no dice, he still pees. I am stumped and worry that this behavior will not go away. Should I give treats every time he does not pee?