Shock collars in BDSM play: Are they safe?

The use of dog shock collars in BDSM play isn’t that widespread, but they’ve been suggested as fun toys pretty much forever. And I can definitely see the appeal. Low effort, high impact: What’s not to love about pressing a button and bringing someone to attention (or to their knees)? If you’ve ever gone to youtube and looked at videos of people testing shock collars (I mean, haven’t we ALL done…