Hill's Prescription Diet b/d Dry Dog Food is clinically proven nutrition to help fortify their brain against the effects of age-related decline and improve age-related behaviours in older dogs. Clinically tested to support memory and learning ability in older dogs, it protects vital heart & kidney function, supports a healthy immune system and promotes a urinary environment that reduces the risk of developing struvite & calcium oxalate crystals. Hill's Prescription Diet b/d Dry Dog Food is a complete and balanced food for dogs in need of Brain Aging Care.