I have been told that the dog is not there anyway. The story I heard at Scampton many years ago was that there had been several attempts to locate the grave but all had failed (many after dining in nights)...the railings were put round to prevent any further excursions into the dark armed with a spade. (And again heresay - the dog was a target of a certain other Vulcan squadron who retaliated during the continuing war of the Tirpitz bulkhead).