Deboned Chicken is the skin and flesh of the chicken without the bone. It's just that and therefore it is an excellent source of healthy protein for dogs.
In addition to being a flavor that dogs love, chicken also delivers Omega-6 fatty acids that help sustain healthy skin and shiny coats along with B3 and B6 vitamins, phosphorous and selenium as well.
Chicken Meal is a dry, rendered product from whole chickens that has been through some processing to remove water and fat. It looks like brown flour, and it's a highly concentrated protein/mineral resource.
Chicken meal is basically chicken with a longer storage time. It's a protein-rich food and also Vitamin B12, Tryptophan, Choline, Zinc, Iron, and Copper resource. However, it's an already processed material in dog food manufacturing and makes the food ultra-processed.
Oatmeal is a source of complex carbohydrates, releasing sugar and energy gradually, rather than overwhelming the body as simple carbohydrates may. They are a valuable source of dietary fiber, iron, and other essential vitamins.
Oats are especially high in B vitamins, which may aid in breaking down fats for the nervous system and help support muscle tone, skin, hair, and eye health. Oatmeal is considered an excellent source of dietary fiber and key vitamins and minerals.
Barley is source of carbohydrates for energy, B vitamins and fiber for a healthy digestive system. In some cases it has been known to lower cholesterol. It's a good alternative grain for dogs that are allergic to corn or wheat.