If you have that many issues of your patent using a leash on you then perhaps it was used in an inappropriate manner. If this still troubles you 35 years later then you need to seek psychiatric counseling over this. Here's my FWIW. Having been a nurse is the ER and critical care units for 14 plus years and having encountered hundreds of patients with severe psychiatric problems that they believe were caused by their parents, I have never had someone say that it was caused by their mother or father putting a harness on them.
As for your you tube videos, are you telling me that there are not examples of parents all over you tube doing inappropriate things with their kids? You can find just about anything you want on you tube.
Of course you can find stuff on youtube... but the question here was WHY do people associate these harnesses with dog leashes... seeing parents with kids this way is WHY people associate it with dogs. PARENTS who use them and treat their children like dogs.
So no I don't need therapy thank you very much and my dad used it exactly as I've seen them used. Tethered to a parent. Just as everyone here is saying. You think your kids don't know or won't remember being leashed to you.... but you don't know that.
FWIW ~ I am not a psychiatric patient. I really appreciate the correlation though. Wow.... personal attack much?