This unfortunately can be quite common in senior spayed dogs
First, even though she is not showing any recurrent signs it would be advised to collect a first morning sample and rule out a relapse of a urinary tract infection. Some dogs will not show any other signs besides leaking and with one previously diagnosed this is high on my list, often antibiotics weren't continued long enough to resolve it completely or the antibiotics were not effective to treat the infection
For more information on urinary incontinence in dogs:
Once a uti is ruled out there are two medication options to treat this problem
1.) 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
2.) Estrogen which is compounded and given 2-3 times weekly longterm. The primary side effect can be bone marrow suppression so it is advised to check a cbc prior to starting this medication and about one month in to ensure it has not effected the bone marrow production of red and white cells
Both are very effective and every veterinarian has a preference. I prefer proin but personally my dog got loose stool on it so she is on an estrogen supplement. Both of these are shown to strengthen the urinary bladder sphincter so that when relaxed female dogs do not urinate
If bloodwork was not run then I would highly advise it to rule out any kidney changes as well. I have had several dogs with kidney disease that begin to leak and are higher risk for a urinary tract infection as well. One of my closest friends' dogs is one of those cases this past month.
Please let me know if you have any additional questions I can assist with in trying to control her urination issues
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