Hi there,
Our favorite two formulas for calcium oxalates are Dang Gui Shao Yao San and San Ren Tang. Generally, in a cat, we use San Ren Tang first. It seems to inhibit stone formation and makes the urine slightly more dilute to favor stone dissolution. It seems to work well, making me think the stones we see in animals are more dynamic and in a state of flux then we might realize. The herbs seem to shift that balance away from stone formation, resulting in a net dissolution. If we're lucky, the formula will control some of the symptoms of urgency, helping to buy you some time for stone dissolution. We also favor moving AWAY from carb-based foods and toward higher protein diets. This is contrary to standard practice, but appears to work well. In all likelihood, these higher protein levels are normal for a carnivore, but the restriction of carbohydrate intake reduces the amount of inflammation going on in the urinary system, removing the particulate matter that forms stone nidi.
Hope that helps you out. Let us know how it goes.
Steve