You'll find that a lot of people here of the opinion that Royal Canin is just over priced junk food. When you look at the ingredients, the chicken is not the main ingredient. This explains why from another post:
The first ingredient in this dog food lists chicken. Although it is a quality item, raw chicken contains about 80% water. After cooking, most of that moisture is lost… reducing the meat content to just 20% of its original weight.
To reflect its lighter mass, this item should more accurately occupy a lower position on the list.
So you are left with grains as the next 4 out of 5 ingredients and no real meat content until much further down the list. Check out the Diet & Nutrition forum and you will learn a lot about how to read dog food labels and what is appropriate for dogs to be eating.
Royal Canin German Shepherd Ingredients
Chicken, brown rice, oatmeal, chicken fat, barley, rice, natural chicken flavor, pork meal, soy protein isolate, sodium silico aluminate, wheat gluten meal, dried beet pulp (sugar removed), powdered cellulose, anchovy oil (source of EPA/DHA), soya oil, potassium chloride, salt, calcium carbonate, dried egg product, sodium tripolyphosphate, DL-methionine, L-tyrosine, taurine, dried brewers yeast extract (source of mannan-oligosaccharides), vitamins (DL-alpha tocopherol acetate (source of vitamin E), inositol, niacin supplement, L-ascorbyl-2-polyphosphate (source of vitamin C), D-calcium pantothenate, biotin, pyridoxine hydrochloride (vitamin B6), riboflavin supplement (vitamin B2), thiamine mononitrate (vitamin B1), vitamin acetate, folic acid, vitamin B12 supplement, vitamin D3 supplement, choline chloride, glucosamine hydrochloride, marigold extract (tagetes erecta L.), trace minerals (zinc proteinate, zinc oxide, ferrous sulfate, manganous oxide, calcium iodate, sodium selenite), tea (green tea extract), chondroitin sulfate, rosemary extract, preserved with natural mixed tocopherols and citric acid.