I am not sure exactly what Proin is but I had a female cocker with incontinance (she was 8 at the time) and my vet had us try a a few different drugs to help with the problem. Seamed like niether helped with her problem so then my vet did some blood tests on her hormone levels which came back slightly irregular so Lucy went on some kind of hormonal therapy drug and that seamed to work tremendously. I don't recall what the drug was cuz it was like 6 years ago... but whatever it was it worked. I know is was for sure some type of hormonal replacement. Before we found the cure Lucy was mainly wetting herself while sleeping or just laying down resting. Her whole side would be completely soaked. After a few weeks of taking the drug it almost completely stopped. So maybe they can test her hormone levels. Just a thought. She seams to be fairly young still for the problem to be age related.

As far as the growths or warts... I am not sure about that. I wonder if maybe she could have them inside her urinary tract too and that could be causing a problem as to the incontinance. Seams if it were from the urine itself it would be more of like a irritation instead of growth type warts. But I really dont know... just my opinion.

Help you find something that will work.
Take Care,
~Candee