Sorry to hear about your pooch, dawngirl! We get a lot of animals in with stones and crystals, and it's not pretty!
I'm glad that you caught it early enough that treatment was easy. A dog came in a couple weeks back, who hadn't urinated in a whole week!! The owners said "he just kept circling around, but never peed. We thought he was just going crazy." Some people are so dumb.
Anyway, hugs to you and your dog! What's his name, by the way?