The Whirlpool Agitator Dog Kit 4-Pack is used for replacing the agitator directional cogs. Agitator dogs, which are also known as dog ears, ratchet cogs, or agitator cogs, control what direction the top section of a dual action agitator moves in. Basically, the upper part of your washer's agitator should only move in one direction, while the lower portion has the ability to rotate in multiple directions. There are four cogs per package that are made of high-quality plastic.