I would call the previous owners. It would be helpful in knowing what your pup's parents are and any other info the breeder could give to you.
I just recently met a person at the park that had a GSD/Sled dog/? mix. He said that they were breeding them that way, I forgot for what reason and what they were calling this breed.
Emma is so cute, she looks like she's going to have a lot of hair. My dog is a long coated GSD and I still get asked what kind of dog he is!!
Bear GSD 10/16/11
Elsa GSD 12/23/03 - 11/10/11