Some ultrasonic devices have LED flashlights to guard you from Pet attacks even at the hours of darkness. They are really safest to hold at night, especially when you suspect the presence of aggressive dogs. Then, as they start to bark, say “silent” firmly but calmly. The moment they pause https://pawpressnews.com/best-dog-deterrent-device-for-dogs-the-ultimate-solution-for-bark-control-and-training