We've always owned rotties. I have one now but I live out in the country. My dogs are never out unless we are outside with them. Unfortunately where we live, if a guy breaks into our home and our dogs attack him, the cops will put our dogs down even though we have signs in the windows that say beware of dog. Plus we would be the ones charged. I have been caught in my pj's while putting the dogs in their kennels when a jw crept up behind me and scared the shit out of me. If the dog would have been loose it might have been another story like this. The dog would only be doing its job.
I have also been out in service when it was written on the back of a territory card that the householder had a vicous dog but the idiot still got out of the car and got bitten on the back of the leg. He went to the hospital to get a shot but what was sad was it was an elderly widow who lived out in the country all alone with her protective dog. That dog was taken away from her for ten days put in quarantine.
I've also been out with some really lame brain witlesses over the years that really do believe they are protected by angels but in another breath will ask if I will go to the door because I own rotties. My reply is NO. I train my own dogs and know them but some of the most stupid comments I hear are unbelieveable. Put the stupid mags in the mailboxes. Even when I have no trespassing signs up, it doesn't stop the witlesses.
Bottom line: you see a sign, DON'T GO IN!