When I spent time in the states, I was placed with people who had dogs. All but one (and I stayed with a total of 11 families) had these for their dogs. I had to grin and bear it, different customs and ideas etc - but it is quite common place over there.
I did hear about a couple of incidences when a dog had chased something through the fence (adrenaline so high they didn't feel the shock) and then they couldn't get back onto the safe side
There was also an occasion when I was staying with the most wonderful couple and their Berner 'Bentley' - one evening Bentley was going bonkers outside - I peek out the window and there is a momma bear and her cubs trashing the garden - Bentley chased them, but slammed the breaks on before he got to the flags