Pig / Swine Fencing Guide

Overview

Pig fencing is specifically designed to contain animals that root, push, test boundaries, and exploit weak points in fence lines. Unlike cattle or sheep, pigs challenge fences at ground level, making post stability, bottom wire placement, and soil conditions critical design factors.

This guide covers permanent and electric pig fencing systems, fence height requirements, rooting prevention strategies, post spacing, cost planning, and installation considerations. It is designed for small farms, pasture-raised operations, and commercial swine setups.

This page focuses only on pig and hog containment systems. For cattle, goats, sheep, poultry, or mixed livestock fencing, refer to the Cattle Fencing Guide, Goat Fencing Guide, and Sheep Fencing Guide.

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What This Guide Covers

Best Fencing for Pigs and Hogs

Pigs require fencing that handles rooting pressure at the base, lateral pushing force from their muscular shoulders, and enough height to contain sows and boars that can be surprisingly athletic. The most effective permanent pig fencing combines woven wire field fence (6×6 inch spacing or tighter) with a continuous electric wire running 6–8 inches from the ground along the inside of the fence. The electric wire stops pigs from rooting under and pushing against the woven wire, dramatically extending fence life.

For smaller operations and pasture pig systems, a 3-strand electric fence with strands at 6, 14, and 22 inches is a cost-effective alternative to woven wire. Pigs trained to respect electric take the fence seriously, but the system requires consistent energizer maintenance and vegetation management. Commercial hog operations typically use concrete or wood panel barriers for confinement areas with electric for pasture.

Electric Fencing for Swine

Electric fencing is highly effective for pigs because they are sensitive to shock and quickly learn to avoid a hot wire. A 2-strand electric fence at 6 and 14 inches is the minimum for trained adult pigs; add a 22-inch strand for boars and gestating sows that may push fences when restless. Use a minimum 1-joule low-impedance energizer — pigs' thick, dry skin reduces conductivity, requiring adequate shock energy to be effective.

Pigs must be trained to electric fence in a controlled environment before relying on it for containment. Place a single strand in a small, familiar pen and allow pigs to investigate. Once trained, the same animals will respect electric fence reliably for years. Move trained pigs to pasture by first walking them along the energized perimeter before leaving them unsupervised. Never move untrained pigs directly into an electric-only enclosure.

Preventing Rooting Under Fences

Rooting is the primary fence failure mode for pig operations. Pigs follow their instinct to root regardless of feeding and will eventually work under any fence not specifically designed to resist it. The most effective solution is a continuous electric wire or board running 6 inches from the ground along the inside fence line — the shock or physical contact stops rooting behavior before pigs reach the fence.

An alternative is burying woven wire 6–8 inches underground at the base of the fence line, creating a buried apron that stops rooting under. This adds installation cost and labor but eliminates the ongoing management required with electric wire. For temporary pig paddocks, running a strand of electric fence along the ground inside the perimeter at 4–6 inches is the quickest fix.

Pig Fence Height Requirements

Adult pigs rarely jump but can climb or push over short fences. Minimum height for standard breed sows is 32–36 inches; boars require 36–42 inches. Gilts and growing pigs are contained by 30–36 inch fencing. Heritage breeds like Berkshires and Tamworths tend to be more athletic than commercial breeds and may require 42-inch fencing. Farrowing pens and areas with piglets need additional protection from predators at ground level.

Height is less critical than bottom containment for pigs — a 28-inch fence that doesn't allow rooting is more secure than a 48-inch fence with a 6-inch gap at the base. Prioritize bottom-of-fence design over height when choosing fence specifications for swine.

Woven Wire vs Electric for Pigs

Woven wire provides reliable containment without electrical maintenance but requires the addition of an inside electric strand to prevent rooting damage to the wire itself. Budget $4–$6 per linear foot for woven wire with electric offset installed. The system is labor-intensive to install but requires minimal ongoing management once established. It's the preferred choice for permanent pig facilities.

All-electric systems cost 50–70% less to install but require consistent maintenance — vegetation management, monthly voltage testing, and energizer upkeep. They work well for rotational pasture pig systems where portability and low cost outweigh the management overhead. Many pasture pork producers use electric for summer grazing and move pigs to hardened facilities for winter.

Best Fencing for Pigs and Hogs

The most effective pig fencing systems include woven wire, electric, and hybrid designs that combine physical barriers with behavioral deterrents.