I'm getting worried about Glen Hurd. We cannot afford to do without him in this forum.
Years ago I made up a circuit powered from a 12 volt DC battery to operate a car ignition coil as a source for an electric fence HT voltage ~ 28,000 volts. Pulse width and power can be varied from light, to a kick in the goolies heavy.
I have never used it to date and - if you're reading this Glen - you would like it, I will send it over to you. To make it more effective could you fork out for razor tape to surround your home on insulators.
You could also equip the Prius with razor tape so that any bear touching the car body defences would receive a shock, but you would need to train the wife how to get in and out of the car when the system was on. Pedantic police officers who want to put a ticket on the car should be told that the same protection exists on the Mars Curiosity rover.
I hope someone can spin out this humorous line a little further.
David in HK