Just trying to get away from dogs for a bit. On second thought, I've recently posted a macro, so I'm right back where I started. The NEXT one won't be the same if you'll forgive me this one time.
Could I suggest a wider deapth of field. (Now, I am saying that not because it spoils the shot but more because if the rock was more obvioius then it would tell the "Against the odds" story better - in my humble.)