Hi Diane S-
Sorry to hear about your pup! As you probably know, the s/d food can only be used short term due to it not being complete and balanced. The c/d food can be fed long term. That being said, they both are formulated to dissolve and prevent struvite stones. Neither work to dissolve the oxalate ones. They cannot be dissolved, only passed or removed.
Are you using the dry or canned prescription food? If not using canned, I’d give it a try. It would add more moisture to the diet which in addition to dissolving helps flush both types of crystals/stones.
Also, Royal Canin has an Rx food for bladder and urinary crystals as well. It has an S/O index which is supposed to help prevent both types of crystals. Maybe your vet would approve of one of their urinary formulas. That is what I feed to my cat with this issue. I also add plenty of canned food to his diet. I know that canned food is expensive, but as we both know, the surgery with an overnight stay cost a lot more!!!
I’m curious, has your dog had urinary tract infections too? If yes, have they been treated with antibiotics?
As was mentioned to you above, try to get as much water and plenty of bathroom breaks as possible to help your pup’s pee diluted. I wish you the best!
