You are right about JRT snapping the neck of a rodent. One of my Jacks was sitting in the yard, not hunting anything when a huge rat jumped out of a bush near him. The dog instinctively grabbed the rat and snapped it's neck. Then he looked embarrassed at what he had done.
In the movie Gangs of New York there was a scene where they tossed a terrier into a pit with rodents and taking bets on how many they would kill in a given amount of time.
59 posted on 01/22/2014 8:20:49 AM PST by cripplecreek
(REMEMBER THE RIVER RAISIN!)