Tiny is the bull that belonged to the Mystery Gang as their mascot.
Scooby-Doo! Mystery Incorporated
His portrait was seen in the Burlington Library, as part of a group portrait of the Mystery Gang. (Night Terrors)
His still form was captured in a time-frozen scene in the Sitting room. In the scene he was drinking water from the conquistador's helmet that was the Segundo Llave. (Nightmare in Red)