Hmmm. I'll have to check that out. I've always fed my dogs Science Diet, and according to the vet my dogs are so healthy, they're physically two years younger than their actual age.
But, then again, I do supplement their diets with a lot of meat (cooked very rare); raw carrots, cod liver oil (which makes their coats shine like a showdog's), scrambled eggs (sprinkled with garlic powder, kelp, spirulina, and brewer's yeast), etc. They get a couple of soup bones a week to chew on as well.
Several years ago I got my hands on a recipe book for dogs that was written by veterinarians. The premise of the book was that no living creature can thrive while eating nothing but the same dried up kibble daily. That made sense to me. They recommended feeding animals nothing but a real foods diet and forgoing dog food completely. But, then I heard other vets say to never feed your dogs table food, but to only give them dog food.
I decided to opt for a solution in the middle. 50% of my dogs' diets are commercial dog food and the other 50% of their diets are real food prepared according to vet recommended recipes. It's worked out very well. My two geriatric dogs are as spry as puppies. Their eyes sparkle, their coats glisten, they are trim and muscular, and the vet says they will very likely live a few years longer than their peers.
I'd always thought that Science Diet was the best brand, but if it isn't, I want to know. I'll most definitely be checking into it. I love my dogs, and they depend on me to take good care of them.