My Dad, a veterinarian, told me no dogs were brainier than border collies, no dogs wasted their brains on being clowns more than poodles and none had a determination to brains ratio larger than JRTs.
Evidently if you get enough JRTs in one place things can get out of control really fast. My Beagles would listen to me, once I got their attention.
JRTs must reach critical mass, like uranium.