[anonymously]

What did the vet recommend? I would stay with the chicken and rice for a few days, then slowly add the new kibble to it. You haven’t even had him 72 hours…give him a few days to adjust, he’s only a puppy. Add a splash of water to his food.
Some science based information here: http://skeptvet.com/Blog/category/nutrition/

Homemade diet recipe and tips here: http://www.homeovet.net/dynamic/php/downloads/dog-c8470f2c75dbe4b683205c3919ee2310/dog_diet_complete.pdf