Join Date: Sep 2008
Location: SW of Chicago
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Figuring the protein based on the percentage in the food is the wrong approach. You need to figure how many grams of protein your dog is getting per day, not look at the percentage that is in the food.
A dog needs 1 gram of protein per pound of body weight per day (Ohio State Univ. College of Vet. Med., Nutrition Studies).
If your dog weighs 70 pounds and gets 350 grams of food in a day, assuming the protein is about 75% digestible (they range from about 70%-80%, Department of Biochemistry, Physiology and Nutrition, Norwegian School of Veterinary Science, N-0033 Oslo, Norway and Department of Basic Sciences and Aquatic Medicine, Agricultural University of Norway, N-1432 Ås, Norway) and the food contains 28% protein, your dog is getting about 74 grams of protein in a day, which is quite adequate for their requirements. In contrast, the same dog getting 250 grams of a 33% protein food (often you feed less of the high protein foods due to the calorie density) is getting about 62 grams of protein in a day, and is protein deficient.
Yet another way in which the dog food industry uses marketing to convince people that their food is "better" without anyone realizing the science behind the hype.