A Green Dog can also known as a blitz-and-engage depending on the particular defensive terminology. The point of a Green Dog is to add an extra man, late into the play, when a man-to-man coverage blitz is called by the defense.
A simple example of a Green Dog occurs when a linebacker is supposed to cover the running back man-to-man when a blitz is called. If the running back stays in to help pick up the blitz, the man in coverage then becomes an additional blitzer – that is a Green Dog. On a Green Dog, the responsibility of the linebacker who was originally in coverage changes, and he is asked to become another blitzer in the pressure scheme.
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