I'm not sure where you're located or if this food is available in your area, but Jack has a very sensitive stomach and we've found that Eagle Pack Holistic Large & Giant Breed works great for him. It is corn and wheat free and has lots of great ingredients like blueberries, cranberries, carrots, peas, etc. It's all human grade and has great additives for large & giant breeds like glucosomine & chondroitin and lots of antioxidants and vitamins. It was actually specially designed for Danes and if you check out their website at
www.eaglepack. com you will see the studies that they've done with Danes. Jack is still on the puppy variety (they recommend it until 18 months) so you could do that or you could go with the adult version.
They also make a regular, non-holistic variety that's great as well, but it does have some wheat in it, so if that upsets your pups tummy I would go with the holistic. The cost for both is the same it just depends on what the stores near you carry. (There's a "Where to Buy" link on their website that allows you to enter your zip and find the closest retailers.)
Around here it costs about $35 for a 33 lb bag. Our Swissy and Pyr each weigh around 100 lbs and they each eat about 4 cups per day.
My sister-in-law has two danes and she feeds Eagle Pack as well. It's helped one with hip dysplasia and one with yeast and allergy problems to improve their conditions dramatically.
It's also the recommended food of "The Great Dane Lady", a canine nutritionist and quality Dane breeder. (
www.greatdanel ady.com).
Geeze, I sould like a commercial - sorry I just really like this food!