Wow that article on struvite stones was fantastic!! I had found a sit similar to it, again on a Dalmatian site since they are genetically prone to stones as well, but this was even better. I am going to insist on a longer treatment course since every time she is only on 2 weeks at a time then retested and perhaps put on another 2 weeks with a small break in between. The antibiotic is effective because we erridicate it either briefly or to trace amount so longer therapy time would probably be much more effective. Thank you again