Purina Pro Plan Veterinary Diets UR Urinary Ox/St Canine Formulas are made with high-quality ingredients and formulated to help reduce the risk of urinary stone formation in dogs. The science behind our therapeutic diets represents a collaboration between Purina nutritionists, researchers and veterinarians. Promotes a urinary environment unfavorable to the development of both sterile struvite* and calcium oxalate crystals Helps dissolve sterile struvite stones* Helps reduce the risk of both sterile struvite* and calcium oxalate stone recurrence UR Ox/St canned diet contains significant moisture, contributing to total water intake Appropriate protein content to help maintain ideal body condition and lean body mass Contains antioxidants Great taste