Ask about 50mg of cranberry powder a day (I eyeballed the amount from a 250 mg capsule for humans).

I have heard of ultrasound being used to break up the stone. Maybe that's what the vet meant?

It's not a really intrusive prodecure...so hopefully it can be done at some point.

Someone else here might know what can be used to help dissolve the stone...

Glad it isn't arthritis...that stone could have caused poor kitty to not jump up a lot!