Yes! Rusty's parents are both stock but both have produced coated pups. Our breeder was surprised there was only one in his litter of 10 if I remember the count correctly. It was a large litter.Two stock coats can throw long coats in a litter. It's more common with the show lines.
Means that there is still an undercoat but the hair is long. It's the technical term for the huge majority of "long coats" people have, they say a true long coat has no undercoat, but most GSDs have both coatswhat does long stock coat mean? is that the kind that grows to look more like a collie rather then a shepherd lol
Mego gave a pretty good example of what your pup's most likely going to look like in the above post. There's no mistaken that dog for anything else but a GSD for anyone that knows the breed.Hopefully he looks cute when older as Google images "long coted GSD" was like a horror show they didn't even look like GSD