Definition: A defensive strategy in which a linebacker or defensive back vacates his normal responsibilities in order to pressure the quarterback. The object of a red dog is to tackle the quarterback behind the line of scrimmage or force the quarterback to hurry his pass.

Also Known As: blitz

Examples: When a defensive line is having trouble putting pressure on the quarterback, the defensive coordinator may decide to help them out by sending one or more linebackers or defensive backs on a red dog.