Here is the process most people go through about food... finding the highest quality food that is affordable and that the individual dog in question will actually EAT and do well on (as some dogs thrive on a food, others may not). I feed raw, and invite you to check out that section of the board. My dogs do insanely well on it, as most that I've seen do. However, you are by no means selling your dog short by feeding a high quality kibble. Unfortunately, Eukanuba is not a high quality kibble. It is quite frankly crap in a bag. I know, because I fed it prior to my dog getting hot spots, having TONS of skin issues and having poops so big that I needed a dump truck to haul it all away. Due to these issues I really did a lot of research on canine nutrition. I found that most mass produced mass marketed kibbles (i.e. Science Diet, Eukanuba, all Purina products, Iams, etc.) are awful. It's extremely frustrating because they are all not cheap and you would think if you spent that much on a bag of food it would be good. NOPE! Here are the ingredients in Eukanuba large breed adult food...
Chicken, Corn Meal, Ground Whole Grain Sorghum, Ground Whole Grain Barley, Chicken By-Product Meal (natural source of Chondroitin Sulfate and Glucosamine), Fish Meal, Natural Chicken Flavor, Dried Beet Pulp (sugar removed), Chicken Fat (preserved with mixed Tocopherols, a source of Vitamin E), Dried Egg Product, Brewers Dried Yeast, Potassium Chloride, Calcium Carbonate, Salt, Flax Meal, Vitamins [Vitamin E Supplement, Ascorbic Acid, Beta-Carotene, Vitamin A Acetate, Calcium Pantothenate, Biotin, Vitamin B12 Supplement, Thiamine Mononitrate (source of Vitamin B1), Niacin, Riboflavin Supplement (source of Vitamin B2), Inositol, Pyridoxine Hydrochloride (source of Vitamin B6), Vitamin D3 Supplement, Folic Acid], Sodium Hexametaphosphate, Fish Oil (preserved with mixed Tocopherols, a source of Vitamin E), Dicalcium Phosphate, Choline Chloride, Minerals [Ferrous Sulfate, Zinc Oxide, Manganese Sulfate, Copper Sulfate, Manganous Oxide, Potassium Iodide, Cobalt Carbonate], DL-Methionine, Dried Chicken Cartilage (natural source of Chondroitin Sulfate and Glucosamine), Rosemary Extract.
Notice that chicken is followed by three grains (the main one being CORN - yuck). This is a grain based food, meaning your canine who is a carnivore is eating a food based on something he cannot digest well and just passes through his system. Here is the ingredient list for Canidae, a popular holistic kibble made with only human grade ingredients...
Chicken Meal, Turkey Meal, Brown Rice, White Rice, Lamb Meal, Chicken Fat (preserved with Mixed Tocopherols), Herring Meal, Flax Seed, Sun Cured Alfalfa Meal, Sunflower Oil, Chicken, Lecithin, Monocalcium Phosphate, Potassium Chloride, Choline Chloride, Linoleic Acid, Rosemary Extract, Sage Extract, Dried Enterococcus Faecium, Dried Lactobacillus Acidophilus Fermentation Product, Dried Aspergillus Oryzae Fermentation Extract, Dried Bacillus Subtilis Fermentation Extract, Inulin (from Chicory root), Saccharomyces Cerevisiae Fermentation Solubles, Yucca Schidigera Extract, Mixed Tocopherols (source of Vitamin E), Zinc Amino Acid Chelate, Manganese Amino Acid Chelate, Iron Amino Acid Chelate, Copper Amino Acid Chelate, Cobalt Amino Acid Chelate, Vitamin A Supplement, Vitamin D3 Supplement, Ascorbic Acid (source of Vitamin C), Niacin, Thiamine Mononitrate (Vitamin B1), Riboflavin (source of B2), Beta Carotene, Calcium Pantothenate, Pyridoxine Hydrochloride (Vitamin B6), Calcium Iodate, Folic Acid, D-Biotin, Sodium Selenite, Papaya, Vitamin B12 Supplement.
Five out of the first seven ingredients are meat. This is a meat based food, with no CORN or Sorghum. Much better. There are also foods out there with no grain at all, like Innova IVO and a few others. You can absolutely mix kibbles if you like, and encourage you to do so especially when transitioning from one food to another. Yogurt in small amounts helps aid digestion, and I feed that as well.
Raw ground beef and raw egg usually will get them eating BTW.