collar and fence installed for granny Bernese Mountain 45 kg. The fence was positioned on an existing grid, which limits the risk of wire breakage, because it must be said that it is very thin and breaks easily. The collar is in place for several months on our dog, she quickly understood the system and we have no problem fugue. It is certain that there are stronger fence but the price is absolutely not the same ... We are completely satisfied with this anti fugue kit.