Anything you do can be used to construct a theme against you in court.
Gun signs might indicate a predisposition to want to shoot folks. You might argue - no - it was to deter crime.
The jury decides which tale is convincing.
As far as the alarm sign indicating you have stuff - perhaps. But a gun sign indicates you have small, desired and easy to sell stuff. Also, in a neighborhood of equally appealing homes - say affluent or just nice - your lack of a sign is a target indicator.
The dog - well, the dog own its own can run out and do evil. I doubt your 1911 can do that.