Whenever a fencing district is established as to small stock, such as hogs, sheep, goats, etc., four (4) barbed wires securely fastened to posts firmly set in the ground, not exceeding sixteen feet (16') apart, the bottom wire twenty inches (20") above the ground, the second wire ten inches (10") above the first, the third wire twelve inches (12") above the second, and the fourth wire twelve inches (12") above the third; or five (5) sound rails securely fastened to posts firmly set in the ground, the top rail four and one-half feet (4½') above the ground, and the others properly spaced beneath, shall be a lawful fence within the district.