Dogs' intestinal tracts are short compared to the long ones we humans have, Dr. Turkell explains. It's more difficult for them to digest fruits and nuts than it is meat. They also say that vegetarian diets transform Fido from fat to fit. It's too much carbohydrates. But a dog's closest relative in the wild is the wolf.
Wolves kill plant eaters like rabbits and eat their intestinal contents which contain carbohydrates.
If commercial pet food contents turn you off, you can cook for your dogs. Just because you're having pasta doesn't mean your pet should. Dr. Turkell has no quarrel with cooking for your dog, but he believes the best dog food comes from reputable pet food companies who spend millions researching pet nutrition. Animals thrive on monotony. They eat to live whereas people live to eat.