Welcome! I am Dr. Altman, a licensed veterinarian and happy to answer your questions today.
This unfortunately can be quite common in senior dogs
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 are two medication options to treat this problem but only one used in male dogs
-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
It is used to strengthen the urinary bladder sphincter so that when relaxed (sleeping for example) dogs do not urinate
Please let me know if you have any additional questions I can assist with in trying to control the urination issues
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