Royal Canin Urinary S/O is a dry dog food clinically proven to dissolve struvite stones and reduce the recurrence of both struvite and calcium oxalate bladder stones. It's one of the most prescribed urinary diets for dogs with a stone history.

Controlled minerals — particularly reduced magnesium, calcium and phosphorus — limit the precursors of struvite and oxalate stones, while RSS (relative supersaturation) technology helps maintain urine chemistry that doesn't favour crystal formation. Increased sodium promotes water intake and urine dilution, and antioxidants support overall urinary tract health. Veterinary authorisation required for long-term feeding.

Vets prescribe Urinary S/O as a long-term diet after stone removal or first crystal detection — recurrence is common without ongoing dietary management. Owners stick with it because the alternative is repeat surgeries, and the diet works when fed consistently.