High tensile fixed knot woven wire is pretty strong, but not indestructible. Goats will put their front feet on the horizontal wires to reach up to eat grass or weeds outside the fence. Over time, the horizontal wire may slide down depending on the weight of the goats, how many goats, quality of wire, etc. Bulls, even weaned to yearling age, tend to put more pressure on fences, especially if there are cows or heifers on the other side. Saw a big bull once destroy a section of new tight fixed knot fence. He just placed his front feet on the strands and walked it down. I guess he was bored. Animals also like to press their sides into it to scratch.
An electric strand will keep animals away from the fence and help protect it from damage.