The trainer for my yellow lab told me that JRK's are generally owned by people who have horses. He had no clue why that was.
Gidget is such a neat looking dog!
You can't throw a rock at a fox hunt or horse show without hitting a JRT or two.
I have heard a couple of explanations for this - one, they are companions for the horses (I doubt that, they are too darn yappy and most horses don't like small, fast moving, noisy objects); two, that horses need grain, grain attracts rats, JRTs keep down the rats. The latter makes more sense to me.
Funny pic of poor Gidget being chewed on! My horse trainer's Jack, appropriately named Nipper, gnaws on my Lab's ears. The Lab is very stoic about it, when she's had enough she just lifts her head up so Nipper has to jump to reach her ears -- and Nipper gets bored and wanders off.