What squawk code should you use when you cancel IFR after entering Dogface?

When you cancel IFR flight following, it is standard practice to squawk 1200. This code designates a VFR, or Visual Flight Rules, flight, which is what you are operating under once you have cancelled your IFR clearance. By squawking 1200, you inform air traffic control that you are not under IFR anymore and are now operating as a VFR flight, allowing for other pilots and ATC to accurately track your flight status.

In the context of cancelling IFR in airspace like Dogface, where various traffic might also be present, the use of 1200 facilitates a clear signal that you are no longer following IFR rules and are responsible for your own navigation and separation from other aircraft.