An electric fence monitoring unit and an integrated energizer/monitoring unit with remote control and communication capability using GSM based cellular technology, and a method for the use thereof, is provided. A simple set of commands can be used and sent, such as through text messaging (SMS) or a smartphone application, to control and/or receive information from the monitoring unit including alerts sent to the user in the case of faults or changes in fence loading. The monitoring unit includes a safety mode that uses time dependent voltage detection to detect when a sudden and significant drop in fence voltage has occurred, as may result when an animal becomes trapped or entangled in the fence. When such a large and rapid voltage drop is detected and the safety mode is enabled, the unit automatically de-energizes the electric fence and an alert is sent to the user advising that the fence should be looked at without delay.