/ADV/ I need your help with my neighbor. This neighbor is causing

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/ADV/ I need your help with my neighbor. This neighbor is causing a lot of ruckus and my current fence is not keeping him now his pooping dog out of my yard.

I am worried that this guy will start weeding my garden, and shingling my roof. I already have a gardener and a roofer. I do not want them to lose their jobs.

I am thinking about replacing the fence with a wall. The total wall will be just shy of 2000 miles in length. As you can imagine, the surface geology, bedrock, and groundwater conditions vary considerably along this length. I am going to need something that will work for the entire length. Hopefully >>>/DIY/ can help me on that front.

What will be the best approach to construct this wall to keep my neighbor and his dog out of my yard?

What I need help with is that my neighbor will be paying for it. He thinks he won't be, but he WILL BE. So, how do I get my neighbor to pay for the wall?

My other neighbor is cool. We don't even have a fence separating our yards. He does have some weird hobbies and interests, but still a pretty good neighbor. So I only need one wall.

Thanks