A fencing system for deterring an animal from entering a facility includes a control box, a fencing base controlled by the control box, and a conduit cable connecting the control box and the fencing base. The control box includes a power supply, a generator board, a transformer and a grid load resistance detector. The generator board produces electrical wave form transformed by the transformer. The transformer connects to two connection braces of the fencing base. The control box operates in an active mode and a halted mode depending the grid load resistance and duration of the load resistance. The fencing base includes a set of fence tracks forming the grid and connected to the connection braces in an alternating style. The control box also supports more than one fencing base. The more than one fencing base can take different shapes and be extended in length to fit facility openings of different sizes.