
You really should rule out bladder stones because if they get numerous/big enough, they can cause a blockage which means the dog would be in serious trouble - in fact I regard this as as dire as bloat with torsion or pyometra in the bitch.
I had one who, on a Basset Walk (awkwards) kept lifting his leg and producing drops only. Had there been snow on the ground, I'd have been able to see blood (as happened with another hound previously). As it was I curtailed our participation in the Walk and got back to the car and off to my vet who catheterised him, felt the gravel grating as he put the catheter in, and opened him up there and then. He was in imminent danger of blocking up. It's not quite so urgent in the bitch as she doesn't have the bone a male has in his penis, to increase the possibility of a blockage.