ghosts in the mist,,it is a hard question to anwer!!!but you all know the sound!!! of thier pawscratchs on the door!!! each one distinctive,like the stripes on a ZEBRA!!! I was privilaged to own snowball.a white golden retriever,with the personality,she was a biggg!! dog,and like bear she had a double coat,and she was immune to the cold!!! one day my brother pulled a tick off her head and it developed an abscess which she supoosedly died from,about a week after she was dead,I heard her feet hit the metal strip as clear as day,out of the blue,in the darkness of the night she hit the corridor and I heard that ENOURMAS!!! BODY FLOP,OUTSIDE MY BEDROOM DOOR,SHE LIKED TO SLEEP IN DIFFERENT PLACES!!! MRPUPPY WENT APE!!!!!HER TAIL HIT THE FLOOR IN THOSE 4 WAGS, AFTER SHE TURNED THOSE TWO 2 CIRCLES!!!AND SHE GAVE OUT THAT SIGHHH!!! AND MY BROTHER TOLD ME SHE CRAWLED UNDER HIS BED THE NEXT DAY,WHERE SHE ALWAYS USED TO SLEEP,THAT IS,WHEN SHE WASN'T SLEEPING ON THE BED WITH ME!!!