my son has 3 dogs and one collar and I to have seen in past one blast and they are free,but the new technology seems to have stopped this he started with flags and a good jolt then reduced the power,it has a warning beeper thats tells the dog to stop or get blasted. and it works great,so great he only puts the collars ononce a week to remind them.
also he planted a flower garden 2 years after the fence and he placed flags in the garden and the dogs wouldnt go near the flags.
as for dogs comming on to his property he has a chow/sheppard mix who lives to hunt ground hog so unless it is a bad @ss dog.charging no problem
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