The device can be effective up to 20 to 50 feet away from the animal, they reported. Though it might not deter a dog from barking, it has deterred them from coming closer to the officer.

This dog repellent ultrasonic circuit will chase away angry dogs. It comprises of a 555 timer IC, a speaker/piezoelectric and a little ferrite transformer. ... The 555 can source or sink 200 mA of ...

Royal Palm Beach woman charged with animal cruelty after allegedly placing several ultrasonic dog repellents "They’re extreme deterrents. They’re very loud, they’re very abusive to the dog ...

In June, a Cheatham County Sheriff's deputy shot and killed an Ashland City couple's dog at their home. Now, all officers are equipped with a device to repel animals that could be aggressive.