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If you want to come up with the best and accurate dog food comparisons, you should consider various things. First, you should understand that the standards of dog food and human food are different. Therefore, you have to learn dog food standards before doing the comparisons. For example, if it is written on dog food package that it is chemical free, then it means that chemicals have not been added until the product reached the factory. During its processing in the factory, the chemicals and steroids are added to it but it is not essential to disclose them on the package.