Fence pliers have a hook on one side and a hammer head on the other for pulling and driving staples.
They are not really designed for tying wire. the jaws are designed to grab and pull out fencing staples
For tying wire a regular pair of electricians pliers with side cutters is better.
http://www.channellock.com/acb/stores/1/349_-_9_inch_Linemen_s_Plier_-_P63C8.cfmThat is an expensive professional grade pair, you can get them cheaper, especially in pawn shops.
Just for interest sake here is a pair of rescuer's multitool pliers.
http://www.channellock.com/acb/stores/1/88_6-N-1_Rescue_Tool_P181C17.cfm