Royal Canin Urinary SO is a veterinary-exclusive wet dog food developed to nutritionally support your adult dog's urinary tract and bladder health. This formula promotes a urinary environment unfavorable to the formation of both struvite and calcium oxalate crystals. It helps increase the amount of urine your dog produces to help dilute excess minerals that can cause crystals and stones. Relative Super Saturation (RSS) methodology is used to help lower ion concentration in urine, which contributes to stone formation. And the specialized nutrition in this dog food wet formula, with a reduced level of magnesium, helps dissolve pure struvite stones and prevent struvite stones from forming. Lower urinary tract issues may be a recurring concern for some dogs. Talk to your veterinarian about keeping your dog on Royal Canin Urinary SO Dog Food for long-term urinary support.