Since the charge for killing or disabling a tank needed only to be pooch-sized, I expect you could scale down the concept and still achieve acceptable results on unarmored, soft-skinned 'rats. And using animakl that are more naturally attracted to such targets than man's best friend seems a reasonable touch as well.
I figure hungry weasels, trained to find food in the trousers cuffs of beltway and collegiate community 'rats or in their briefcases or bags, using tennis-ball sized saddle charges, would do it. Cry *Havoc* and let slip the weasels of politics continued via other means.
-archy-/-
LOL! that would be a good tag line!