[CockalierMom]

Compare the ingredient list and the GA for all the foods and you will see the difference. Whole Earth is a lower protein food and therefore has less of the named protein, such as chicken, and uses the meal form of the protein as the top ingredient rather than the actual chicken. Merrick and Castor and Pollux have more of the chicken which is more expensive than the chicken meal. They probably use the same ingredients for all the lines, (except Organix) just vary quantities of protein.