4yorkies, welcome back to YT
Tell us more about your babies' crystals...I have a lot of experience with stones/crystals, as my yorkie also gets these. There are several people on here who have also lots of experience with them and have dealt with stones/crystals. Did your vet tell you what kind of crystals they are? This is very important in determining the course of action you will need to take in order to get rid of the stones.
You can send me a pm if you want.