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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.

Whether metal fence posts need concrete depends on the environment and the ground they're placed on. For thick earth and areas without significant weather or high wind, you can get by without concrete, but in areas with weak dirt and strong seasonal weather, it's a good idea to install a concrete base on each individual post. This increases the cost but not as much as replacing or reinstalling the fence would.

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 depth of the fence posts depends on the height of your fence. If you’re installing a 6-foot fence, then digging 2-foot-deep holes for the fence posts will help ensure a secure installation. However, if you’re installing an 8-foot fence, the posts will need to be deeper than 2 feet to support the structure properly. Also, consider how far apart the fence posts should be to provide adequate support.