My Golden Retriever gave birth to 9 puppies two weeks ago. I have a runt that is not growing/eating like the others. I'm really worried about her. I've given her replacement puppy milk and put her alone with mommy so she won't be "run over" by the other puppies. I'm on this site to seek some advise.

I'm really sorry but I have to jump offline now, but I found this article written by someone who has raised a runt and had success.
It gives step-by-step how to care for one.

I wish you luck... I will hopefully post more later :)

A Dachshund Puppy Survives - Caring For A Runt Named "Itty Bitty"