How do you know if you’re getting the best dog food for your dog?

By now you've heard the popular advice to wash your dog's food, and that you should never wash your food in the sink again.But what exactly is "good food"?And how do you get the best quality dog food at the best price?Read more:How do I know if I'm getting the right dog food?What is dog food quality?The good dog food is made up of several components that are selected by a dog's digestive system.Th...