Key Benefits. Clinically proven nutrition that can transform your pet’s life. Prescription Diet™ k/d™ Canine is clinically proven nutrition to support a longer and better quality of life in dogs with kidney conditions. Formulated with controlled phosphorus and low sodium to support kidney & heart function. With improved amino acid profile to support your dog's natural ability to build lean muscle daily. With a delicious taste your dog won't resist. Available in dry bags and cans.