When you are working with your dog, one of the most important things to remember is how much you and your mindset affect your dog and their mindset. 
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Meaning: if you are stressed, they are likely to be stressed as well. If you have faith in yourself, the work you are doing, the precautions you have put in place (i.e. muzzle, etc.) and your dogs efforts, they are much more likely to succeed. 

What does the word "No" mean in your household? 
In most households, dogs hear the word "No" a million times a day and it means nothing. 
Why? Because nothing happens. 
If there is no consequence, follow through, or repercussions, it is just a word.