I use a prong collar for training with my white GSD and I have never seen any indication on his neck that he's even had one on, let alone puncture wounds.
I have heard of people sharpening the ends of the prongs so that they are super sharp. Obviously, I do not agree with doing that.
That photo makes me think of propaganda being put out there to make prong collars seem evil, when they are actually a good training tool when used properly.
The next thing will be a pic of a dog with his head nearly burned off and still smoking (ugh) with a pic of an e-collar next to it.
Or one with a dog 's eyes bulging out of his head, with a choke chain next to it.
Anything can be used safely and correctly or abused terribly.
The first thing I thought of when I saw the posted pic was that it looked like someone took a hammer and nailed it into his neck.
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