Our Classic Framed Diamond, Guard Dog Working Do Not Enter Sign can be attached to the door, wall or window of your home or business. The text and design work of this sign is laser engraved into sturdy plastic. Each sign comes with an adhesive foam backing, allowing it to be attached to any flat surface. Comes in multiple colors. Our Dog and Pet signs are great for your home or business. This security sign is great for your home or business premise. Let would be intruders know that the property is protected by guard dogs.