When I got my puppy a few years ago he was on Diamond puppy and I wanted him on a better food as well. I gradually switched him over to Fromm Chicken and what a disaster. Raging diarrhea. My vet suggested the Iams Low Residue and some flagyl, which did clear it up but I didn’t want to keep him on the Iams – horrible ingredients not to mention it costs an arm and a leg. We had lots of boiled hamburger and rice as well. Finally I switched him over to Natural Balance LID Lamb and he tolerated that but the protein/fat was not what I wanted because he is a hunting dog and needed more. I am happy to say I have him on Orijen for some time now and he is doing very well at 2 and a half, but it was a long, messy road. I think some of the better foods are a bit rich for some puppies – not that they are not good quality food. Maybe try something really simple like I did and then gradually get him on what you prefer. Good luck.
