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Yes, fence posts need to be installed below the frost line to ensure stability and prevent heaving caused by freezing and thawing cycles. The frost line is the depth at which soil freezes during winter. By placing posts below this line, often around 3 to 4 feet deep or as recommended for your specific region, you reduce the risk of the ground shifting, which can lead to leaning or unstable fences. Adequate depth provides better anchoring and helps maintain the fence's integrity, ensuring it remains secure and upright throughout changing seasons.

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.

Generally, the height of your dog fence should be 3 times the distance from the ground to your dog’s shoulder. For most small breeds, a 4-foot high fence will be more than enough to keep them from jumping out. Medium-sized breeds like Golden Retrievers, Labradors, and German Shepherds will need at least a 5-6 foot fence to stay contained. Large breeds that are also excellent jumpers, such as Greyhounds, may need a 7-foot high fence. 

The average cost to install a wrought iron fence is around $3,150, with typical project costs ranging from $470 to $10,500. The final price can vary significantly based on several factors, including the fence's total length and height, design complexity, metal thickness, and your property's topography.

For materials alone, you can expect to pay around $25 to $35 per linear foot. When including installation, the cost is typically between $50 and $70 per linear foot.

Additional factors that can influence the total cost include:

• Custom designs, decorative flourishes, gates, and columns

• Labor costs in your area

• The need for permits

• Land preparation, such as old fence removal, tree or bush clearing, and land grading

For an accurate estimate, it is best to consult a professional fence installer with the specific measurements and design requirements for your project.