Must train to use

This product does work, however, you will need to train your dog to use it for several weeks. Some reviews said they were able to simply put it on. I did not find this to be the case. If my dog were a puppy maybe. I have a one year old lab that weighs 60 lbs. It took her a little over a week, but she now stays in the boundaries. She is smart enough to tell when it is off, but I like the fact that I can easily change how far she can go. This gives a static shock that may not be effective if your dog is stubborn or has very thick fur I mounted my reciever outside about 4 feet off the ground.

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