This unfortunately more common in senior spayed dogs but I have seen an occasional boy dog that has this and often it is related to a urinary tract infection but sometimes it is that he is not aware that he is going, the sphincter that holds urine in is not strong enough.
First, even though he is not showing any signs it would be advised to collect a first morning sample and rule out a urinary tract infection. Some dogs will not show any other signs besides leaking
For more information on urinary incontinence in dogs:
Once a uti is ruled out there is just one medication for boy dogs to treat this problem called Proin which is given once to twice daily. I always take a baseline blood pressure to ensure there is no issue before starting this medication because it can exacerbate hypertension if undiagnosed
Please let me know if you have any additional questions I can assist with in trying to control his urination issues
If you have more questions or if I can help in any other way, please do not hesitate to ask! If you would like to accept my answer, please press RATE OUR CONVERSATION. Bonuses are always welcome (I am not compensated in any other way). Thanks!