When I first learned to train for competition obedience, all problems were solved with more "drive."
Drive was loosely defined as getting the dog as "high" (aroused) as possible. I.e. tugging, playing, chasing food, games..anything that increased a dog's arousal level.
...Which is pretty dangerous when you pair a dog with a genetic predisposition to becoming over adrenalized with a trainer that has no concept of what the words "drive" or "arousal" really mean, and what they do to a dog chemically and emotionally!