Check out this webpage to read up on almost every available dog food:Dog Food Comparison Charts

When we first found Pup, she was about six months old, and we put her on Iams Puppy. That was before we realized all the testing that Iams does!
We switched her to ProPlan Puppy, since at that time, the greys were eating ProPlan Lamb and Rice. We didn't have Pup on Puppy food for long though - she was on adult food by the time she was about 9 months, since she was packing on too many pounds!