I saw that Eve has this same thing as Daks! Daks, too, had stones in his bladder, his urethra and his kidney.

The one thing I am upset about is that the first time we went to the ER vet, we were encouraged to switch to the Hills SD. This seems to be a complicating factor if the stones turn out to be the oxalate, rather than the struvite. I realize you can't know the type of stone if it isn't passed or other wise removed, but, I would have thought it might show up in an urinalysis...that is why I asked you in Eve's thread if diet was an issue.