Thanks, Doug - and I should have clarified that by evening, we are restricting his access to water after 9:30 or so; so he's not up all night needing to go out. But he sat at the door to the bathroom (where the water fountain is) and banged on the door for an hour... and we've been locking him in his crate so he can't visit the "big white water bowl" upstairs....LOL!
Yes, he's on an oral dose, and as of today (one day early) I'm starting the 1/2 tab once a day routine (had been 1/2 tab twice a day).
I think part of the peeing indoors problem is that he's been showing a touch of doggie dementia this past year or so; he seems to forget to either ring the bell on the door - or, tell JIMMY to ring the bell. So I'm just treating him like a puppy - we go outside about every 2 hours....LOL!!