A cattle prod is a tool used for electrocution from a safe distance, usually to stun an animal.
During the Rabid Infection of Superior, Nebraska, hunter Sam Winchester created a makeshift cattle prod with tools stolen from Bob's Superior Hardware so that he could capture a Rabid for questioning. After drawing in George, Sam questioned if the man was still capable of talking. After George's response made it clear that he could, Sam used his cattle prod to stun George unconscious.
It is unknown what ultimately happened to Sam's cattle prod. It was last seen leaning up against a table in the hospital room Sam was using as his base.