You are suddenly required (and granted the power) to cause every breed of dog to vanish except for one. What breed of dog are you most likely to spare?

It would be a difficult choice, as all dog breeds have their dangers and downsides, but I would probably pick the border collie. They make terrible pets due to their high intelligence and energy levels, but they are excellent bomb-sniffing dogs and herding dogs. Picking the border collie would prevent almost all dog-related human fatalities and cripple the pet industry while still providing for the niche situations in which dogs can actually be useful.

What would your choice be if you were forced to spare one breed?