When it lands, get the dog to fetch up and bring it back. This makes obedience a game. These guys love to be loved. When they are home and not working love them to pieces. When they stay where they are told and come when called, praise them and love them up for it.
Guide dogs love to please.
They are happiest when doing something right and getting attention for it. It's not uncommon for a handler to give extra praise and hugs after an extremely hard day.