From the "sharpened prybar working knife" school of thought, all I've done with mine so far is used a small DMT diamond sharpening card (1200 grit) and maintained the factory flat grind. I prefer to look down the edge and sharpen, following the angle by eye, because it's quick. Just be aware that the initial factory edge has a variable angle. It's more acute down near the handle, and becomes more obtuse toward the last third where you'll be hitting hard with it.

I am aware that it could be made sharper with oxide stropping or ceramic rods, but with more than a pound of weight behind it it is already capable of some serious destruction. Putting a surgical edge on a Dogfather is sort of like taking a water-loving mutt to the pet salon just before a hunting trip in a marsh.