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My uncle has a 200 lb. Mastiff and 150+ lb. St. Bernard with an underground fence and it works fine. Don't know the brand right off hand but they offered different size shockers pending how big the dog and how stubborn. A friend has the wireless transmitter thing that you can set a radius on and it works fine on his Shepard. The advantages are the underground wire can be set up to specific boundaries where as the wireless simply allows a radius of a certain area.
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