Barking can get out of control! This can be frustrating or attract unwanted attention. Training dogs can be hard, and even harder if they are older! This is why vets and dog experts recommend this device. This device calms down barking in a gentle, easy and harm-free way. Combine this with positive reinforcement to help train your dog to bark only at times needed! It's simple. Plug, and place the device near your dog during the times you need it to be silent. Three barks will turn on the device! It emits a sound only your dog can hear to calm him or her down.