I just got an 11 week old puppy! He is the runt of his litter, 11 weeks and only 4 lbs! Tiny tiny tiny. Well the breeder was feeding him diamond, but he doesnt seem to like it much. He has been eating a mix of puppy fromm and wellness super5mix (my last dogs' food). I am switching over his food slowly but don't know if I should go with Wellness core... I read somewhere that grain free isn't recommended for puppies? Either that or Fromm's food. Another question is if I should get puppy or adult food? I don't think Wellness has an all life stage, but I think Fromm does. His farts have also been silent and deadly! Any opinions are appreciated.