Again, like the Beware of Dog sign, it signals imminent danger, without expanding on what that danger entails. (gamesradar.com)
The owner must also display a dangerous dog sign in the window of the house. (itchmo.com)
The police chief will determine if they are vicious, a finding that could lead to restrictions on their owners, including having to display a dangerous dog sign on their property. (ohmidog.com)