Graves at Dead Dog Farm

In episodes 19 (Black Widow, 2.012) and 20 (Checkmate, 2.013), at least two fresh graves can be seen directly outside the front door of Dead Dog Farm. 

Images from episode 19 (Black Widow, 2.012)

Images from episode 20 (Checkmate, 2.013)

The size of the graves leads one to think they may belong to fallen dogs.

The area is desolate, the house abandoned. The file on Dead Dog Farm in Irene Littlehorse's possession states, "Sold many times. Doesn't seem to want people around it." Is it possible that the area came to be used as a pet cemetery?