I'm not a raw feeder but I definitely would not consider switching food on my 8 week old puppy.
No drastic diet changes should be made for a few months; even if you changed from one kibble to another kibble - it would have to be done very slowly.
You would be doing your little one a disservice to be trying new things at his point in his life.
Wait until he's a little more mature and his digestive system is more mature; then consider your switch if you are still sold on it.
__________________  Mommy to Lucy, Ringo, and Matthew |