
Hopefully someone will be along that can give you breed specific answers. I can only say, that, for my breed (Long Coat Chihuahuas) I refuse to discuss adult colour.
I had a litter of cream and whites, with one stunning gunmetal grey pup. Naturally he stood out big time and was much admired. However, I was emphatic that he should not be sold on colour, as I suspected that he would turn fawn. As an adult, he's fawn with a blue mask. My breed alters too much for me to be pushed into guaranteeing colour.
It may well be that you can be sure with your breed, but, as a matter of interest, I'm throwing this into the mix!