I have to weigh in on what Sophie's Daddy said - when I was growing up, my family had a 3/4 Great DAne, 1/4 Lab mix. Basically, she was a Great Dane, size and build-wise with a Lab-ish face. Sweet as can be, I have often told Gracie stories here on Pet Talk. Gracie lived on dry dog food (kibble) of what brand I cannot remember, but not any "specialty" brand, and it was always supplemented with a little bit of canned food stirred in to make it "tasty." She also got table scraps, dog treats, etc. Great Danes have an average life-span of Great Danes is usually 7-9 years from what we were told, so we were a little sad when she started to grow grey at 5 or so. She lived to be an amazing (to the vet, his staff, etc.) 14 1/2 years old. To what did the vet attribute this? She's spoiled rotten and loved too much!