Is that how those dog collars work, two electrodes?

I don't suppose you know what kind of shock is given, voltage, waveform, duration, current..etc...? ( REALLY nerdy question I know but most things like this are very easy to make, or ask an electrical guy who's even more of a nerd to make )

How much does one cost just out of interest and has anyone apart from the guy off Jackass actually used one?

A bit off topic I know but I think it's an interesting question.