Some goat species have thick layers of insulation that require higher voltage. Goats tend to experience fences, which is why space cables are short and high enough so that they won't explode. As usual, goats can be protected with an electric fence with a voltage of 4000-5000 V. If the species you are raising has a thin layer of skin, 2,000 to 3,000 volts of electricity will be enough to keep it inside the enclosure.