[Esme's Mommy]

I am letting Esme's hair grow... (I think) Anyways, will we have to cut off the puppy coat?? Is there such a thing? Or does the hair just change as she gets older? I am a little bit confused about this. Also, the parts of her that are chaging color, will we have to cut the black off the tips eventually, or will it just lighten too? These might seem likes silly questions, but I am VERY confused!
Thanks!