A Fair Safe Warningthis is like blasting an air horn to a dog. It will scare them to death but it won't hurt them. However don't overuse it. The first time or two, they will probably shiver and tuck tail like you would if someone blasted an air horn at you that you didn't expect. This is when you show encouragement to calm them down, while fixing the behavior. Training AssistantsThis is not a panic button. It is a trainer - for you and your pet! A Behavior Deterrent cant live without a tool of some sort to help stop rude, unwanted dog behaviors like jumping, barking, counter-surfing, soiling the house and whatever else the little hooligans can devise. Sonic frequency sound waves are unpleasant to a dogs ear, and can be used to interrupt or stop behaviors in a flash. More Deterrence But SafeOur ultrasonic devices are safe to use long-term and cause no negative side effects or hearing damage to pets or people. Our outdoor deterrents are specially created for outside use, and the indoor deterrent is most effective when used inside. Handheld DevicesThere are also ultrasonic bark control devices that will fit in the palm of your hand. These smaller devices are meant to deter your pup from barking anytime, anywhere. Handheld devices usually come with a lanyard or strap to secure the device to your arm, so they can easily be taken on walks or a trip to the park. Warm TipsIts important to note that although this device works for dogs of all sizes, it shouldnt be used on dogs that are less than 6 months oldonly suitable for dogs aged 6-8 months. So, if youve decided to invest in ultrasonic bark control for a neighbors dog, youll want to make sure its safe to do so. We're committed to finding the right barking solution for you and your dog, if you're not satisfied with your product, you can return it within 30 days.