PetStop invisible fence shown here how it works, because these German Shepherd dogs can not break that invisible force field for a long time without the largest correction (shock) by the neck, they each bear's neck. What you can not see is that it is buried under the snow on the ground a cable that sends a signal to every dog a collar worn around the neck of dogs. Guide dogs for the first time, you will hear a beep to let them know that they are out to return to the border nearLine. If you listen closely you can hear the sound of the dog lighter and then secures to know who is going to get a shock if he did not.
Keywords: invisible fence, German Shepherds, animal, pet, cat, dog, petstop, shock
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