East German GSD versus West German GSD

Our MP unit actually has a few K9 teams assigned to it. I've noted one Malinois and one GSD. The GSD though is huge. It's about 100 lbs of muscle, which leads me to believe it's a European line GSD. I don't have pictures, yet, but the dog has the straight as opposed to the sloped back of an American line GSD, it's got the black and brown and grayish coloration in its fur, and it's larger than the 80-85 lbs by the breed standard. I doubt it's a Shiloh because it's fur isn't shaggy enough. If I were to guess I'd say it was an East German GSD. Does that breed still exist or is it crossbred into other GSD lines?