I've fed my dogs Science Diet for about 20 years. My husky lived to be 12, my beagle is chugging right along toward 16, and my other dogs love it. They maintain overall great health and I rarely have to take them to vet for anything but vaccinations. In smaller bags it's as expensive as any other premium food, but I buy the 44 pound bag and it's considerably cheaper. I've been very pleased how Science Diet grows and maintains dogs.