Editor's note: This story contains descriptions and images of dogs hunting rats that could upset some readers. - - -Subscribe to The Post Most newsletter for the most important and interesting stories from The Washington Post. The sound of a rat screaming in the jaws of a terrier is the same sound that a stuffed squeaky toy makes. It seems so obvious. Of course the toys sound that way, because that sound awakens something deep in a docile dog's neurons that says: Shake it. Shake it till it's dea