Some of the grain-free dog foods are heavy in protein. That was a concern of mine for my more mature boys. High protein values do NOT cause kidney problems and my holistic vet said that if my dogs do not have a kidney problem the high protein food was fine. (Years ago the thought in vet sciences was that a high protein diet caused kidney problems.) But it is very important for older dogs to have a high quality protein because the quality proteins are more digestable than lower quality proteins. Shoe leather has protein in it, but it's not very usable by a body.
Personally I feed Canidae and Evo, but there are many good quality foods out there right now. Your best bet is learn how to read labels and find a food you're comfortable with and that works for your dogs. I have a friend that feeds her dogs ProPlan. Not the greatest of dogfoods, but her dog had digestive problems, ProPlan works and given her dog's problems she doesn't want to tinker with what works. (She has tried other foods without success.)
One more thing, in the US Eukanuba is not the best thing around, however, I notice the opening poster resides in Norway. I have no idea if the Eukanuba ingredients are better there, but I bet they're different.