What puppy food are you usng currently? Rocco is on the cusp of turning 4 months old and I've had him off of puppy food almost a month. I'm feeding Fromm's Beef Frittata which is an all stage food. He was too sensitive to the chicken in the kibble. That being said, if you go to an all stage food I don't think there should be a problem. I am by no means an expert, just going by what I've seen and read.