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. Because the food your dog eats plays an important role in his or her overall health and well-being, Hill's nutritionists and veterinarians have developed clinical nutrition especially formulated to help support your dog's bladder health. Prescription Diet c/d Canine is formulated with the following benefits: Reduced levels of protein, magnesium and phosphorus to help limit the building blocks of crystals and bladder stones Low sodium to maintain normal blood pressure Added antioxidants to control cell oxidation and promote a healthy immune system