The Germans do forced retrieving with all their dogs, as do most American top field trial trainers. This gives the most reliable result, but it's hard work and I have no idea how the result will be if you have no experience doing it. An experienced helping hand could be a big step forward.
As Munsey says, go a few steps back. Look on the internet about placeboard training. Make the dog come and sit on a board in front of you without a dummy. If this works perfect, add the dummy to the training and make him come ans sit in exactly the same way on the board. It might help.
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