Kick - used to damage an object / move an object a great distance
Tap - used to get attention (and in this case, without damaging or moving the object a great distance)
I'd definately pay to find someone in Sydney who can do the same job as Cesar Millan. In fact, I'm looking for one right now. His results do all the talking. Happy to hire any dog behaviourist who can tell the difference between a Kick and a tap.