If you are not moving your animals, it might be a good idea to let the new owners know there is a cemetery. I work for a real estate attorney and there was an incident a few years ago in which the new owners were tilling a garden and discovered a tiny coffin. It was thought that it was a baby but it turned out to be a much loved cat. Now there is a new law here (Iowa) that if you transfer property you have to let the new owners know if there is a burial site on the property. [Posted in FML issue 3730]