Digital on-screen graphic

Digital On-Screen Graphics or a DOG/DOG Tag is the name for the overlayed station logo that many broadcasters use for easy identification of their channels.

The DOG was first used on satelite and cable television systems in their early days, when broadcasts were unmarked in the boquet.

On Digital systems such as Sky Digital and FreeView, where channels have a set EPG number and a name displayed across the top of the screen when changing channel, large or intrusive DOG's have been deemed unessacery by most users. The most notable case of user pressure over a DOG was BBC Four, who reduced their large, purple DOG to a small, transperent grey one, and moved it from the bottom left to the top right, after serious complaints from users.

Many news broadcasters place a clock alongside their DOG, giving it legitimacy if it is moved into an unorthodox position, such as the bottom left.