If you are what you eat, as they say, what about your beloved four-legged friend? What role does nutrition play in your dogs life, especially in its health? As a vet will quickly reveal, for your dog to remain healthy, it must take in the right nutrients for both its size and age.This revelation, then, puts you on the spot. Are you properly feeding your dog? To know whether you are doing so, here are some signs your dog isn’t getting the nutrients it needs.1.