"Dog Food" What's the harm? (part 1)

Many people do not believe there is anything "wrong" with dry dog food.
Consider this:

According to "The Holistic Guide for a Healthy Dog" by Wendy Volhard and Kerry Brown, D.V.M,
"Raw foods [or homemade cooking] are the most easily digested by a dog. They pass through the dog's stomach and into the intestinal tract in 4 1/2 hours. So, after that time span, dogs are already receiving the energy from that food."

Then they go on to say:

"Dry food takes up to 16 hours. So if you choose to feed your dog any kind of processed dog food, it will be in his stomach morning, noon, and night. So what's the point?"

This next paragraph is what really got me thinking....

"Enzymes make the body tick. They are either already contained in the body, or made through what we feed our dogs. When that dry dog food sits in the stomach of a dog, it does so because there are not enough enzymes in the stomach to break it down. Remember, a dog's stomach is designed to deal with [whole foods]. So the stomach sends a message to the brain, "Hey, brain, we need some more enzymes down here." And the brain comes back, "Okay, okay, but I need some time." It then gathers enzymes from the heart, the liver, the kidneys, and other parts of the body to be transported to the stomach. In the meantime, the food sits there until enough enzymes are collected for digestion. This process is called enzyme robbing. Robbing various organs of the body of the enzymes that they themselves need to function correctly can have a detrimental effect on these organs. This situation can give a dog a predisposition for problems in those organs, can hasten disease, and reduce the life span of the dog."

Convinced yet?

(note: while this book contains valuable information, it is written on the premises of feeding raw, and like I said before I do not recommend the raw diet the way our food industry is)