
What was the breeders feeding before the Beta and why did she change before the puppies left?

Unless you mean she used it from first weaning and just put up with it not suiting

But then you say she was fine when you first got her so not really sure what is going on but the vet could well be right. It is
very common for puppies to get upset tummies when they first arrive in their new homes and yes, scrambled egg is commonly given and can work just as well as chicken, fish or any of the other easily digested foods recommended while things settle down. If you are going to change her diet again be sure to do it very gradually over a couple of weeks.