The Saw Guard Dog makes your saw safer by only allowing the guard to be open during the actual cut. As soon as the thumb is no longer holding in the button, the guard will automatically snap shut and conceal the blade so that if something goes wrong, the worker won't be cut. Kickback is one example of the blade getting caught in the wood and running back to the user, cutting them severely if the guard is pinned up and the blade is exposed. However, unlike pinning the guard up illegally with a nail or piece of wood, which keeps it up all the time, the Saw Guard Dog allows for an easy transition back to the concealed position, keeping the user safer from getting cut in these accidents. Pinning the guard up otherwise is asking for injury. Why take that risk when the Saw Guard Dog gives the same convenience of making the cut but also protects the user?