Below are some of the top large breed puppy food's and where corn falls in there list of ingredients along with the protein%. I like to have a high protein % in my dogs food to build muscle fast. These 2 things were important to me when I was picking out a puppy food.
Corn / Protein
Purina Pro Plan Large Breed = #3 / 28%
Purina Puppy Chow large breed = #1 / 27%
Purina One Growth & Dev. = #3 / 28%
Pedigree Healthy Start = #1 / 27%
Eukanuba Puppy Large Breed = #2 / 26%
Iams Large Breed Puppy = #2 / 26%
Hills Science Diet Large Breed = #1 / 26%
Natural Choice Large Beed Puppy = #3 / 28%
Royal Canin Maxi Puppy 32 = #4 / 32%
O_E_J I don't know what you feed your dog, but I would be interested to here how it compares. I have also posted a pic of one of my dogs that was fed Royal Canine Maxi Puppy 32 (9 Months old)
http://www.duckhuntingchat.com/album_pa ... pic_id=370