I don't think you do. What makes those people qualified to rate dog food? All I'm saying is just because one of those sites say a food is great doesn't mean it is. I'm sure some of them are good, but from my experience, some of them are worse.
Uhhh.. they're not just pulling crap out of their ass.
What the raters are doing is nothing more than tracking what exactly each ingredients mean per FDA regulation and accurately interpreting them.
For example, ingredients are listed by weight. So you know if it says,
"Chicken, Brown Rice, White Rice..." Then you know chicken is the biggest ingredient. More importantly, the dog food company is
being sneaky as the combined makeup of two rices are greater than 'chicken' and therefore the #1 ingredient.
There are MANY ingredients that should be a red flag, most of them plague major supermarket brands (Purina, Beneful, Science Diet, Pedigree, etc):
-Corn (shitty filler, usually #1 ingredient in major brands)
-Animal (Chicken, Pork, Beef) By-Product (FDA-classified as leftover carcass giblets, gizzards, and bones all ground up into a meal)
-Gluten Meal (pure leftover grain shells devoid of any nutrients)
List goes on.
What they're doing is not rocket science. You can read them and 'get it' in few minutes. They're not doing some secret shit. Look at the ingredients of Beneful vs Taste of the Wild (both actually similar in price too).
Beneful
Ingredients:
Ground yellow corn, chicken-by-product meal, corn gluten meal, whole wheat flour, beef tallow preserved with mixed-tocopherols (source of Vitamin E), rice flour, beef, soy flour, Minerals (tricalcium phosphate, salt, potassium chloride, dicalcium phosphate, calcium carbonate, zinc sulfate, ferrous sulfate, manganese sulfate, copper sulfate, calcium iodate, sodium selenite), sugar, sorbitol, water, animal digest, phosphoric acid, sorbic acid (a preservative), L-Lysine monohydrochloride, dried peas, etc...
Taste of the Wild
Ingredients:
Duck, duck meal, chicken meal, egg product, sweet potatoes, peas, chicken fat (preserved with mixed tocopherols), potatoes, roasted quail, roasted duck, smoked turkey, natural flavor, tomato pomace, ocean fish meal, salt, choline chloride, dried chicory root, tomatoes, blueberries, raspberries, Yucca schidigera extract, dried fermentation products of Enterococcus faecium, etc..
Just look at it. You can tell Beneful is pure pile of dog shit.
If YOUR dog is having problems regardless of good or shitty kibble, then obviously problem lies outside of (!gasp) kibble.