Actually only the head moves, the Krag connection is that you would not need a heavy rifle with low light optics to keep your crops safe if you have a SMW.
I think the Japanese developers have been watching local Godzilla and other horror movies. What is scary to them may not be as scary to a pig that has not watched the same shows.
Been with others hunting pigs with dogs, a pig that is been held down by big catch dogs makes a lot of noise that has to be un-nerving to other pigs. Those squeals can be heard a lot further than 1/2 kilometer.