I have a 3 year old boxer/pit bull mix who WON"T bark. She did a few times when she was younger but has not in a year. Yet she does in her sleep when she is chasing something! Tazer might work, but I think that might be more of a scream. Did I tell you the time I was invited to go sky diving with a blind person? I'll never do that again. I still have nightmares of a German Sheppard screaming at 10,000 feet.