Review on KAiF Handheld Dog Repellent and Anti Barking Control Device - Powerful Ultrasonic Dog Bark Deterrent - Safe and Humane Bark Stopper and Dogs Repeller - Effective Behavior Pet Training Solution by Stefan Eddy

Don't think this will save you from a big bad dog rampage. I have 3 very friendly dogs but they bark too much. This will save our outside dog from barking at the postman, but will ignore him if he hears the approaching 4-wheeler. It never works on our Yorkie and his barking is the main reason I got him. However, our cute Yorkie starts shaking when we use it to stop a Yorkie from barking. So it would work for her if she was loud. So basically, one of our obedient dogs is exposed half the time, one all the time, one never. So if Kojo gets in your way, run! This thing won't save your skin.