Do a search here on Boxerworld and use search words such as "feeding" or "food" or "Eukanuba" and you'll find tons of information on foods and which are considered the best.
Good luck.
BTW, I prefer Innova. There are quite a few good foods out there you might be happier with than Yukky Nuba. Nutro Natural, Innova, California Natural, Canadae, Wellness, etc.
Do the search and you can find all the useful information you need to make an informed decision on feeding.