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Yes, you can use a floor jack to remove fence posts. Attach a stem to the base of the fence post so you can position the floor jack underneath. The stem can be a scrap piece of wood attached with nails or a sturdy nail itself. Put the jack beneath the stem and push the lever to lift up on the fence post and remove it from the ground.

You can use pressure-treated wood for a horizontal fence, but you’ll need to purchase a thicker and higher-quality variety to ensure it doesn’t sag or warp after you install it. Use #2 pine grade lumber and boards and thicker dimensional lumber, such as a two-by-six. You’ll also need to use stainless steel or hot-dipped galvanized fasteners, as the chemicals in the treated lumber will cause regular galvanized fasteners to rust. 

A barbed wire fence will last an average of 15 to 20 years, but the life expectancy can range anywhere between five and 50 years. Thicker wires last longer, as do fences made with galvanized metal. If the barbed wire fence is in a climate with harsh winters and summers, it likely won’t last more than 10 to 15 years. Failing to keep up with maintenance and repairs will also shorten the lifespan of a barbed wire fence.

Removing fence posts that are set in concrete is something you can't do by hand. You will need an excavator, a strong post-puller, or a jackhammer. If you plan on recycling the concrete base, you may be able to cut the post out with a jackhammer and then set the new post in the existing base. However, it's usually better to remove both the fence post and concrete together. Due to the weight of concrete, you will need a hydraulic removal tool.