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The highest concentrations of omega-3 fatty acids are found in coldwater fish, such as sardines, salmon, herring, tuna, cod, mackerel, halibut, and shark. These fatty acids are also found in lower concentrations in plant foods such as flaxseed, walnuts, Great Northern beans, kidney beans, navy beans, and soybeans.
Look at all of the ingredients in all dog foods, not just those that note sunflower oil added. Omega-6 fatty acids also come from eggs, meats, whole grains, poultry fat, other oils and organ meats. Look for omega-3 fatty acid sources such as fish or flaxseed oils. Check the ratio of omega-6s to omega-3s.