I bought this despite the comments of people saying they don’t “believe or trust” them. All I gotta say is that new innovative ideas gotta come from some start. This collar works amazing for my 8 month old Grate Dane/German Shepherd mix. It took no time at all for her to be trained on what the tone and vibrate means. At first she may have thought the vibrating was bees but she realized that was just another way to tell her she’s a little too far. On the closest setting she stays as close as on...