If you are in a high populated area, you may receive unwanted guests knocking at your door at all hours. Preserving your privacy is an important thing in your home, if you cant have it there, where can you? The hassle of constant sales people or nosy neighbors can be a pain if you really just want to be left alone. Not having people over unless otherwise invited is not something to be ashamed of, its your home and you should be able to have your quiet time.
Having a protective barrier of some kind will be key in keeping out unwanted guests. You might be thinking that you will need a 20 foot barbed wire fence in order to get your message across, but this is not the case. Having a simple fence with your basic locking gate will be enough to keep most people out. Generally a salesperson is not going to hop your fence as there is always another house not far away without a gate, and your neighbor will do the same.
If some uninvited person is hoping that fence to get to you door, then there are bigger problems than just the simple salesperson or nosey neighbor. That is where something like a security dog will come in handy. If you are dealing with the next level of snoop that isn’t deterred by a fence, than a security dog will be good to stop them in their tracks. A lot of times, people are not scared of guns, you could have a 5 foot high picture of an ak-47 on your fence and people will ignore it, but dogs are always feared. There is something about a dog that is just more fearsome then a person with a gun, maybe cause dogs don’t miss.
You can even go one step further by investing in some surveillance cameras. This is great if you are in an area that is having increased break-ins or vandalism. Sometimes you get the occasional group of delinquents roaming through that wants nothing more than to cause other people trouble. Don’t feel too paranoid if you are thinking about having a security surveillance system. There is nothing wrong with trying to feel safe from unknown trouble. Sooner or later, you might have a burglar or someone just causing trouble come along and target your house, having them on tape is better than all other defenses you have.