Hiker1, that would only be possible if the dog were in a coma upon arrival. If one is really worried about them taking out your lone dog, get another dog and that'll turn away even more people.
Any dog owner should know that dogs have a sense of duty and need to have a job. If you give them this encouragement to duty, they will be happy controllable, aggressive dogs who take their job seriously. One bark is for friends and another bark is for strangers or uniforms. I love dogs.
Home Depot or Lowes has a cheapish (185) camera setup that I use and has one cam and the remote but can easily be tied to an extra TV, and it works very good. It takes up to four cams I think.