Also look for multiple meat proteins in the first seven ingredients. Dog food companies sometimes list several types grains in the first seven ingredients. Don't buy food that contains animal digest. Most by-products are not desirable. Call the pet food company and find out what is in their by-products.
Organ meats are good for dogs.
Avoid foods that have sugars or artificial colors or flavors or a lot of added salt. Grains - every dog food will contain some grains, for example, brown rice, barley, corn, wheat, etc. We have found that the goldens in our rescue program generally do poorly on a food that contains corn or soy. These ingredients just don't seem to be beneficial to most goldens. Many goldens are allergic to corn or wheat.