My barking dog

[Big Maduro]

I have a 5 year old German Shepherd. She was a rescue dog. She will bark at everything......everything. People walking donw the street, cars, other animals...the clouds. I have let her down by not trying to work harder on this before. She is so intense,that she will not respond to anything. I'm thinking of one of those bark collars,that vibrate and has ultrsound. Has anyone ever tried these? They cost a lot of money and I hate to spend the cash if they don't work. Mike