Some ultrasonic devices come with LED flashlights to guard you from Pet dog attacks even in the dark. They're most secure to hold in the evening, particularly when you suspect the presence of aggressive dogs. Though equally Hoont and Dazer ultrasonic repellents are supposed not just for repelling intense dogs https://pawpressnews.com/best-dog-deterrent-device-for-dogs-the-ultimate-solution-for-bark-control-and-training