Questions/puppy food/ protein content

In researching the various brands such as Natures Variety, Blue Buffalo and other top rated it seems the protein content is usually in the over 30. It seems I read that it should not be over 30. Can anyone explain why?

Also, Griffin will be eight weeks when I get him. Some have said they don't use puppy food. I was thinking of starting him of mixing adult food with the puppy food he comes with.

I'm so out of practice with bulldog puppies. 

Thanks in advance for any help.

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Kofi and Carol

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You could always go with an All Lifestages Dogfood

My vet always said it is not that protein is bad, but it is the quality of the protein.  Protein from animal sources rather than grain sources.

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