Strong-willed dogs will break the "electric" fence. I had golden retrievers which could do it (with a running start) so I'm sure a GSD with strong prey drive could do the same.
Plus you have to be diligent with keeping the collar clean or at least had to with ours (long long time ago, in a galaxy far far away)
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"Drive more, worry less. "
435i, MPPK, MPE, M-Sport Line
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