I recently saw a NS worker in the normal Neon green vest at a switch near where i live. He was walking back from what i assume to be the switch to the engine, but was walking a dog. My question is this a Bomb sniffing dog because of the tightened security because of the recent events with US security; or is this a personal pet? The train was traveling between two small cities, the one it stopped in is only a city of 40,000, and has little problems with crime. Why would they have a dog?