Dogs and cats are carnivores by nature:

A carnivorous diet is rich in natural enzymes and complex nutrients present in the raw food consumed. The natural enzymes allow the animal to digest and utilize the nutrients properly to maintain resilient health without taxing their own body to produce excessive digestive enzymes. Even quality pet foods are typically cooked or processed which renders them void of natural enzymes. These foods can also lack certain nutrients (fatty acids, antioxidants, vitamins, & minerals) essential to maintaining health. Subsequently, enzyme and nutritional deficiency can cause illnesses and degenerative diseases. To offset this health concern, we owe it to our pets to provide an alternative source of the micro-biological work force (enzymes), and supplemental nutrients they need to maintain resilient health. Animals must maintain an adequate enzyme supply. An animal’s body is fortified with an abundant supply of internal enzymes at birth. Enzymes are also transferred to the nursing infant through its mother’s milk, and through regurgitation in the case of birds feeding their young. Carnivorous animals replenish their enzyme supply by eating raw food which is high in enzymes. To maintain resilient health, a steady supply of external enzymes is crucial for all animals.

We humans upset the balance: Most pet owners try to provide their pets with a nutritious and well balanced diet. However, so-called “complete nutrition” and “proper utilization of nutrients” are totally different. Cooking and processing food destroys the natural enzymes present in its raw components. Foods void of natural enzymes do not digest properly, do not make all of their nutrients available, and burden the animal’s system to provide stored enzymes to complete the digestive process to the extent possible. Undigested foods in the animal’s large intestine are a breeding ground for “undesirable” bacteria which are known to cause certain infections, and can release toxins which are absorbed by the animal through the wall of the intestine. These toxins can cause a variety of destructive actions on tissue throughout the animal’s body and induce illness and degenerative disease.