I've never heard of it. If the breeder is good breeder, you'll be offered a sample bag (not necessarily a zip lock but an actual sample bag). You'll have to keep the pup on it either way at least until you can properly acclimate the dog to whatever you want to feed it.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.