I have a 6 year old website mix that has had struvite stones twice a year if not more since she wasn't even a year old. We have been extremely successful in dissolving the stones with s/d and antibiotics. Only problem is they come back. We tried c/d for over a year and were unsuccessful. Tried giving antibiotics every 6 weeks for a week and they still returned. She drinks distilled water. Anybody have any suggestions on a good food I can get at a pet store that will not help form these stones. I love my vet but I don't want to see him this often. Thanks for any help.