Last week Piper found a spot in the yard and decided to see if she could find China. We filled it back in, but absolutely cannot keep her away. She has become OBSESSED with digging this stupid hole. She will do it with me standing there, knowing I'm going to drag her inside. She gives me that "I just can't help myself" look. She is sticking her nose as deep as she can into it, as if she smells something. I'm wondering if there is something we can put in the hole that will change the odor and not be harmful to the grass, our plants or Piper? Anyone have any proven suggestions for stopping the digging? HELP!