I know a couple guys who provide green GSDs to police agencies. They raise the dogs til they are about a year old, doing environmental imprinting, foundation bite work, drive building, and other basics, but no obedience. Even with great breeding stock, not every dog is going to make the cut. You might have 2-3 dogs out of 10 that can make it as a patrol dog. Maybe another couple would be good for sports, and the rest are pets. I've been watching one pup who has been coming to protection training since he was 8 weeks old. He's 10 months now and has less issues with bite work than most of the adult dogs at the club. Of course they are not putting any defense on him, it's all win win win for him, and he's building up his confidence so that when the time comes for him to face pressure, he'll blow right past it. I know several people involved in police K9 activities- one is a director of training for his entire dept, and he's nationally certified for various things like training bomb dogs, decoying, and sits on a few national level boards. Another 2 guys are street patrol handlers. All of them said the departments are going back to GSD's, vs the Mal because the GSD has traits that make them a better patrol dog. They have a better on/off switch. They will bark more and their size makes them more intimidating- an 80-90lb barking GSD just looks scarier than a 50lb Mal.