For Max the best thing was a big rubber band. Sometimes neighbours have parties & Max gets vey upset & barks deeply non stop, nothing will stop him, except when u put a big rubber band on his muzzle. Its not tight, its too big to pull any fur, but he hate it when he tries to bark & his mouth is forced shut & his lips get stuck in his mouth. he only barked about 3 times with the rubber ban on until he remembered what it did.

I figure the rubber band acts better then grabing his mouth closed because it takes time for ur hands to close his mouth & the rubber band does it during the bark... But he never gets scolded for barking at the door or at something outside in the yard. Hes part guard dog & its in his blood to be protective.