German Shepherd dog

http://www.napavalleyregister.com/articles/2008/05/22/news/local/doc483512ade2ea9816554814.txt

Where does the brindle come from? I have seen a litter of "super dogs" come from an accidental breeding (not mine) between 2 dogs of different breeds (GSD/Pit Bull).  Anyone who views one from said litter, swears they are purebred Mals.  I tease my wife by telling her, I am going to breed her GSD bitch to my brindle Pit, to create some super brindle Dutchies. She threatens me, with bodily harm and divorce.  Of course I am kidding her, but the offspring would look just like Dutchies.