Gear dog is used transmit torque to another gear. It is mainly used for dog clutch mechanism in gear box. When user creates Gear Dogs to gear geometry, fixed joints are also created and connect Gear dogs and gear geometry. Gear Dogs can be attached to Spur Gear, Helical Gear, QFB Gear, Scissors Gear in RecurDyn/Gear.
Figure 1 Spur Gear & Gear Dog
Figure 2 GearDog icon of the Gear group in the Gear tab