The lines that a dog comes from are determined by it's pedigree. Not whether or not it has a vocation, or what that vocation is, or where it was born. A show line dog doing police work is still a show line dog. A working line dog being a pet is still a working line dog. A dog of German lines born in the US is still a German line dog. A dog of American lines born outside the US is still American lines.
As I said earlier, the only way for someone to be able to tell with certainty what bloodlines a dog comes from is to know the different bloodlines and kennels that fit into each type.
That makes sense
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