IMO IAMS isn't the great food for dogs either. Anyhow their are foods you can look into such for a Large Breed such as Wellness, Eagle Pack Holistic, Orijen, EVO, Innova, Blue Wilderness etc
I think you should keep him on puppy food until he matures. I have handful of good sites for you to check into to
The Dog Food Project
Pet Food Additives to Avoid
What ingredients should I avoid in my pet's food?
Pet food ingredients, standards and requirements
I think you should keep him on puppy food until he matures. I have handful of good sites for you to check into to
The Dog Food Project
Pet Food Additives to Avoid
What ingredients should I avoid in my pet's food?
Pet food ingredients, standards and requirements