3) EXPRESS DISSATISFACTION FIRMLY AND CAMLY
If your Great Dane is behaving badly or is engaging in behavior that he shouldn’t, you should give short, sharp commands in a calm voice. This should be a phrase, such as “No” or “Uh oh”, that you say firmly to him.
Once your Great Dane corrects his behavior, you can praise him for that behavior.
Even if your Great Dane does not respond right away, do not get upset, yell, or hit your dog. This will only make him fear you.