That sounds odd. He may not act sick but he could have an infection and can’t help it. I had a horrible time with Kira my female when she was a puppy. The vet said she had puppy vaginitis and once she was spayed it would go away. It did. She would go outside and pee then come in and with in minutes pee again. She is better now but I would ask my vet about that cause it could be something serious or have to do with him not being fixed.