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Purina Pro Plan Veterinary Diets UR Urinary Ox/St Dry Dog Food, 16.5-lb bag; Help your four-legged pal prevent painful stones with Purina Pro Plan Veterinary Diets UR Urinary Ox/St Canine Formula Dry Dog Food. This great-tasting dry food is specially formulated to help reduce the risk of urinary stone formation in dogs. It is crafted in collaboration with nutritionists, researchers and veterinarians to feature high-quality ingredients and healthy antioxidants for a delicious therapeutic diet. This dry dog food is paw-fect for all breeds of dogs in any stage of life and is developed to help dissolve existing sterile struvite stones while preventing both new stones and calcium oxalate crystals from forming in the future.