Abstract: A monitoring system for use with an electrified fence and an energizer (21) therefor, monitoring system being adapted to determine the effectiveness of electric pulses applied to the fence by the energizer (21) and including a voltage sensing device (10) for sensing the voltage of the pulse applied to the fence conductor, a current sensing device (12) for sensing the current in the fence conductor and monitoring device (14) (16) (17) (20) for monitoring signals related to the current and voltage whereby the monitoring device (14) (16) (17) (20) operates an alarm (18) and/or indicates a reading on an indicator (15) when the monitored signals fall outside predetermined ranges of values indicative of lack of fence effectiveness.