All good suggestions posted here. You might want to consider stopping "formal" training for a few days and just play. Then ease back into the training with very short sessions interspersed with playtime. What is his favorite toy? Use that to motivate him and keep him interested. You might also want to check that he isn't experiencing any pain: sounds strange but too many "sits" may be giving him some muscle soreness in his knees/hips. I also agree, at 5 months I would be hesitant to use a prong. For his "resting period" I would go to a flat buckle collar and avoid corrections, then when it's time to phase back in more serious session time, I'd go with a chain or nylon correction collar. The goal here is not to demand perfection, but to teach him to enjoy minding you.
There are two kinds of dogs: Dogs who are German Shepherds, and dogs who WISH they were German Shepherds....
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