I found this when I was browsing the U.S. Patent Office Classifications listings: Class 231, Subclass 7. Electric prod: Subject matter under subclass 2.1 wherein the device has a goad which is electrically charged and which, when placed in contact with an animal, causes an electric shock to be produced in the animal. SEARCH CLASS: 273, Amusement Devices: Games, subclass 84 for a club or billy used by a police officer to provide an electric shock to a human being. [found at http://patents.cnidr.org/pto/classes/us/231/231-007.000.html]
(From the "Rest" of RHF)