Depending on where you live, there may be a formal service-dog training center. Worth checking into. Maybe
$1 has leads?
A long time ago, back in the Pleistocene I think, I volunteered there. The velodrome blew my mind. Slightly more recently I worked in a major city that had a Seeing Eye Dog training program near my office. Very, *very* good doggos. Always made me happy to see them out learning the ropes when I was taking my too-short lunch break.
As I'm sure you know, Standards can be amazingly smart, but when they're puppies are like Tigger - built out of rubber and springs!