I saw that same grading system posted on a few forums and thought "wow, neat". Then I read this article on how it might not add up correctly for great foods:
Grading Kibble - Easily?
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I've received a few emails with similar content recently and would like to address this topic:
Dear Dog Food Project, I have recently found a "grading system" for dog kibble that is very handy. Could you include a link to it on your site please? I think it would help a lot of people to make even more sense of the hundreds of products out there.
I've looked at the list and would like to post a few comments about it. While the original author (whom I do not know) has good intentions and it does look like a good tool at first glance, after closer examination it's not very useful at all.
The biggest flaw is the "extra credit" section, since points of both sections are counted equally. You could basically have a so-so food that has minuscule amounts of a few "gimmick" ingredients thrown in to make the product list look more impressive on paper, but its quality is still not all that great and the food will end up with a fairly high ranking that it doesn't truly deserve. On the flip side, many products with simpler formulations will rank lower just because they only contain a small number of ingredients, even if they are of the highest quality. The grading list disregards the fact that not every dog does well on the same type of food and a "one size fits all" approach.
Let's go over the flawed points of the list....(continued in article)
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So while that rating system might seem great, it does have some very skewed grading points that might make good foods seem otherwise. After reading that I realized its not a simple as "3 points for this and -1 for that". We need to educate ourselves on the ingredients and amounts in the foods, not rely on someone elses grading system.