they can work well for sure. For a start they do need a visual line too, just some electric fence tape around the perimeter will do; you can't expect them to know the boundries just by 'feel'! It doesn't take a lot of training for them to work it all out though.
But yes, if they were a hard headed dog, they're known to just push through the shock (or a highly prey drivin dog will chase something out through it) and then not be interested in coming BACK through the shock! And yes, strays can get in, so can wildlife and people. You also have to keep ontop of the batteries if your dog is likely to keep poking the boundry, though the softer dogs that just accept it tend to never notice if the batteries are dead cos they just accept they're not able to go further!
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