Like a lot of our pups, Tuffy is at times pretty vocal; so much so that it seemed for a bit he'd never stop barking when we met new people/dogs/situations. I also thought like you, that if he understood it was ok at times to speak he'd better grasp the "hush" that we chose to use to attempt to quiet him when needed. It's worked for the most part
I use Zukes small training treats broken into 1/4s & worked the "speak" & "hush" commands right into our fun tricks.
Bella doesn't bark (yet?!) which seems odd.
Good luck!
