There's an interesting article on Toronto Dog Blog today about whether your dog's food gets a passing grade.
They include a link to Dog Food Analysis where you can find out more info about your dog's food and whether it's recommended or not and why.
KC is really really really fussy. The only thing she'll eat is Purina's Top Choice. Alas, this isn't listed so I can't see that they think. It doesn't matter anyway because no matter how healthy or unhealthy it is, she won't eat anything else.