Doesn't Cesar given a physical correction where he gently pokes the dog in certain areas much like another dog would? I have not seen him punch a dog.
Dogs do not need to be hit, any dog, but especially highly intelligent dogs such as GSDs, if you are clear and consistent with your commands, then they will know what you want - you don't have to hit him to get him to do what you want. If they are not, then you are doing something wrong - he is getting confused by by you.
If you are getting frustrated with your dog, far better to leave for a while so that you don't react in anger and work with him when feeling calmer.
if your GSD is eating and eating and eating and losing weight - please consider testing for EPI.
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