If you have your mind made up on a German Shepherd, then what I’m about to suggest as alternatives won’t mean much.
But most Police dogs go to the homes of their handlers so I should think it would be really difficult to find one.
However, I know that there is a large network of rescuers who are devoted to retired racing Greyhounds. When they no longer make money for the owners, they are most frequently euthanized if no one intervenes.
They make wonderful pets and they don’t need as much exercise as most people assume they would. For the majority of the days in their racing career they spend most of their time in their crates or kennels and only get out once a day to run. So if people have a yard where they can run around once a day, they’re fine.
Any training they need is usually already taken care of by the volunteers in the rescue groups. This primarily involves acclimating them to stairs and just being in a normal home.
Everyone I’ve ever encountered who has adopted one of these Greyhounds has been thrilled with them. These dogs are just so happy to be able to enjoy human companionship and the comforts of a home compared to the sterility of the track environment. They make wonderful affectionate couch potatoes perfectly suited for an elderly couple.
I’m sure there’s a group somewhere in your area if you just do a search for Greyhound Rescue groups.
Another possibility would be a retired guide dog or similar type of service dog. Sometimes they have a difficult time with another animal taking their place so it’s better to adopt them out to a loving home. I would assume that’s a more likely scenario vs. a Police dog.
Betty White adopted Tom Sullivans guide dog and they wrote a book together about it.
Obviously most service dogs tend to be Labs or similar but there may be an occasional Shepherd in there.
Anyhow, these are just two alternatives off the top of my head. The other thing I thought about if you’re set on a GS is that some of the better funded shelters have adoption counselors who will set up a waiting list and when the type of dog you specify comes in, they will give you a call.
With the economy the way it is, I’m sure you won’t have that much trouble finding an already well trained dog in need of a home.