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The depth of your post hole depends on your post length. If you decide on a two-rail fence, the posts are likely 6 feet long. You want your hole to be at least 1/3 of the post length. In this case, your post hole should be two feet deep.

If you opt for a three-rail fence, the posts will typically be 7 feet long, meaning your post hole should be 28 inches deep.

The best under-gate dog barrier is one that extends to the ground. This effectively keeps dogs in and won't give them room to squeeze through. However, dogs that dig can still get under the barrier. Deter digging by paving the ground beneath the gate or filling it in with rocks or gravel. Be careful using wire to extend dog gates, as the sharp ends may cut or hurt your dog's paws.

In terms of materials, chicken wire mesh will be the most inexpensive option to use when building your fence. The downside is that it’s not the most attractive garden fence option. In a similar vein, you could choose a DIY fence made out of repurposed items, like car tires, or wooden pallets, either of which would be free to collect. 

Lattice should not touch the ground, as it creates a possibility for rot and a termite infestation. It’s best to leave a gap of 3 or 4 inches at the bottom for airflow and to keep the wood dry. You can add stones, bricks, or other decorative pieces to conceal the bottom of the lattice if desired.