... you notice a "Beware of Dog" sign in a window.
Now granted, a "Beware of Dog" sign is pretty common-place. But in an apartment? Most people at London Square have pets of some kind. Dogs are pretty common. It's a safe assumption that there's a four-legged speed bump lurking behind most doors, so there's little reason to warn someone.
Unless you fear criminals and you know the FBPD is pretty much useless as a crime prevention force.