Can feed/dry pet food be used as a staple food?

Feed can be used as a staple food, because the calories, nutrients and flavors of feed are blended by dog doctors or research and development teams, the advantage is to add ingredients for the care of the hair, or quality protein and dietary fiber to allow dogs to do the healthiest and most complete absorption, if the food is eaten by people to pets, it will be too salty, too spicy or too sweet and other unpredictable problems, therefore it is better to give pets to eat feed.