Hill's s/d Cat Dry Food With Chicken To Support Your Cat's Urinary Health, 1,5kgHill's s d Cat Dry Food With Chicken Bladder stones are collections of mineral crystals that combine together in the urinary tract. They can cause discomfort and lead to more serious problems that require the care of a veterinarian. Hill's nutritionists & veterinarians prescription diet s d clinical nutrition to support your cat's urinary health. In fact, s d is clinically proven to dissolve struvite stones in as little as 6 days (average 13 days).