On one episode of South Park, Cartman's mother calls in a variety of nannies from the television shows to try and overcome Eric's aggression. When all else failed, the Dog whisperer from National Geographic was called in and he continuously used his middle and index finger and lightly pinched Eric's neck while making a sound like "Tsst", saying it was an act of dominance among dogs and it worked quite well on children... The episode was hilarious... anyway, does it really work on dogs?