After downloading the Liars and CheatsDLC pack, The Scratching Post becomes a gang hideout. It is one of a series of hideouts that, when completed, will give the player with the highest score the ability to obtain the Explosive Rifle.
For some reason, there are no doors in the cabin, and it doesn't seem like there have ever been any doors. The windows also don't have any glass in them, and the wooden roof is full of holes. Even the fence is broken down in some places, which makes it look like some kind of a storm or group of bandits destroyed the house. There is an outhouse just next to the cabin as well as a stack of wood. There is a hitching post just outside of the fence where Marston may encounter a horse sometimes, even though the shack is abandoned. Upon stopping in front of the shack, Marston sometimes remarks "There must be someone there". This apparently doesn't have any further meaning, though, as it happens at many other locations as well.