Purina Pro Plan Veterinary Diets is a concise, comprehensive and effective range, formulated according to the very latest knowledge in the field of veterinary science and clinical nutrition and developed with leading edge technologies. Pro Plan Veterinary Diets UR Urinary Dry ...Purina Pro Plan Veterinary Diets is a concise, comprehensive and effective range, formulated according to the very latest knowledge in the field of veterinary science and clinical nutrition and developed with leading edge technologies. Pro Plan Veterinary Diets UR Urinary Dry Adult Cat Food is a complete dietetic pet food for adult and senior cats for the dissolution and reduction of recurrence of struvite stones with urine acidifying properties, urine under saturating properties for struvites and low level of magnesium.