Nutrition is a very serious health matter. It requires serious study, research, and experience, in health, pathology, biochemistry, processing science, food science/technology, and nutrition. A mere opinion expressed on the Internet does not qualify as a serious assessment that people concerned about health should heed.
Further, consider this from the FDA website:
"Dogs, cats not found in dog food
Because pentobarbital is used to euthanize dogs and cats at animal shelters, finding pentobarbital in rendered feed ingredients could suggest that the pets were rendered and used in pet food.
CVM scientists, as part of their investigation, developed a test to detect dog and cat DNA in the protein of the dog food. All samples from the most recent dog food survey (2000) that tested positive for pentobarbital, as well as a subset of samples that tested negative, were examined for the presence of remains derived from dogs or cats. The results demonstrated a complete absence of material that would have been derived from euthanized dogs or cats.
The sensitivity of this method is 0.005% on a weight/weight basis; that is, the method can detect a minimum of 5 pounds of rendered remains in 50 tons of finished feed. Presently, it is assumed that the pentobarbital residues are entering pet foods from euthanized, rendered cattle or even horses."
Please see these links for more information:
Euthanized Pets As A Food Ingredient: http://www.wysong.net/pet-health-and-nutrition/euthanized-pets-as-a-pet-food-ingredient.php
The Pet Food Ingredient Game: http://www.wysong.net/pet-health-and-nutrition/the-pet-food-ingredient-game.php
Myth, Lore and Falsehood in the pet food industry: http://www.wysong.net/pet-health-and-nutrition/fluff-puff-and-smoke.php
The Truth About Pet Food
Book (the website you referred to stole the name from Dr. Wysong's book): http://www.wysong.net/products/cat-dog-health-nutrition-truth-about-pet-foods.php
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