When I started reading this I was thinking..(I know dangerous ha ha) that it would be ok to have one on my car. It isn't like she or any of my dogs would ever be alone in the car so what is the harm/
I used to have a "yorkie on guard duty" in our former house.. and the window faces the street. That made me nervous. The three dogs would sit in the window and wait for us when we were not home.. so cute but......
There were a lot of break ins.. but not dog nervous to the best of my knowledge.
Anyway dh wanted to put the sign back up at this house and I talked him out of it. When you walk up to our front door.. (or a frog farts a mile away either or) the dogs BARK... a lot of BARKING.. and it is hard to tell how big (Sammy sounds LOUD) so I hope that stops would be robbers.
In some of the higher end areas that we used to live in there were drive way robberies... ladies being followed home from the supermarket and such. They wear supermarket, watches, nice cars and are targeted. Really sad... work hard to have nice things and have to hide them