A: I had a neighbor a while back who really disliked dogs. And to his misfortune, he had a neighbor on one side that had two somewhat large dogs. And for some reason they always found themselves in his back yard.
Fortunately (for the dogs that is), his wife hid his rifle, because there were many times when he would have just fired a round or two in each of both of them. He tried to approach the dogs' owner, but his constant requests fell on deaf ears.
And since his wife wouldn't let him shoot the dogs, he ended up doing the only reasonable thing he could think of, build a fence.
When I used to live overseas, it is quite common for homeowners to have a boundary wall around their property. I had driven by the famous boxer, Evander Holyfield's home once a few months back here outside of Atlanta. He too, had a long boundary wall around his house and pool.
Walls can be built with all types of materials. Holyfield's was made of bricks; the Great Wall of China is comprised of large stones.
Some people build these walls to keep others out, while others build them to keep something precious within. But in either case, a well-defined boundary is clearly visible by all.
Once the boundary lines are clearly marked, don't think people won't ever cross them, because they will. Human nature I guess. They want to see what's on the other side. But this also means you now have more leverage on how you can respond to those "curious cats."
In the process, you'll be better able to hold your own stance without justification, and soon enough they'll get the idea. Get it?
-Oz