About this item Great tasting Purina Pro Plan Veterinary Diets dog food promoting a urinary environment unfavorable to the development of both sterile struvite* and calcium oxalate crystals Dry dog food designed to help dissolve sterile struvite stones* Dog kibble that helps reduce the risk of both sterile struvite* and calcium oxalate stone recurrence Includes high-quality protein for dogs Adult dog food formula containing antioxidants