Fencing keeps animals contained and marks property lines, acting as either a physical or psychological barrier. Physical barriers consist of strong materials that block movement, while psychological ones use negative reinforcement to deter animals from challenging less sturdy fences. Common materials for livestock fencing include barbed wire, woven wire, and electrified wire. 

The type of fence required varies based on the animal’s species, age, and management style; for example, beef cattle and recreational horses need different solutions. Permanent fences use different materials than temporary ones for paddocks, impacting cost, lifespan, and function.