How many times have you said No to your dog? Do you think that your dog should know by now that if you keep saying No then it will give you a different behavior? It does not work that way. What could some of the reasons why you keep repeating the work No,
You have not trained your dog and you expect him to know what you want by reading your mind.
You do not give your dog enough physical and mental stimulation.
You are not feeding him the correct food.
You have many people in the family, all giving their own versions of training.
You keep rewarding him with the word NO as each time you say the word, it is acknowledging that behavior.
So take a look at the next time you say NO, WHY.