Not only has The Dog line been ever so helpful, kind and always there to give me advice with my many dogs I’ve had and fostered over the years, but this collar has saved 3 of my dogs lives. One had no recall whatsoever, one was a chronic kangaroo chaser and one was aggressive. Whilst using this collar for only one week on all dogs, I’m happy to say they all did a 💯% turn around! I can honestly say that this collar saved the 3 of them and also me from SO much stress! Anyone that says it’s cruel is totally mistaken, as I tested this collar on myself before my dogs. I would much prefer to use one of these for awhile than ending up with a dead dog. Used the right way with right timing, I can totally recommend it. Thank you ever so much The dog Line and Colin.