Dogs today are still the same as they were in the past. The biological nature of the modern dog is relatively the same as it was for their carnivorous ancestors. Commercial brands produce the worst dog foods and are centered on corn, wheat, or rice as well as artificial vitamins and minerals to pass the standards for required nutrition. Feeding carnivores with this type of product have caused cancer, abnormal fat accumulation, and diabetes. Commercial dog food is known to carry carcinogens. Dog food reviews should base their content on the amounts of real protein and the correct vitamins and minerals.