'How large were the footprints? Were they larger than the footprints of a sheepdog?'
'Yes, Mr Holmes, much larger. They were not the prints of an ordinary dog.'
'Also, you say that Sir Charles ran away from this dog? How do you know?' asked Holmes.
'The ground was soft.' answered Dr Mortimer. 'I saw Sir Charles' footprints outside Baskerville Hall. His footprints were close together as he walked along a path at the edge of the moor. Then he stopped and waited by a wooden gate. After that his footprints changed - they became wide apart and deep. I am sure be began to run. He ran towards the house. I believe that something came from the moor. I believe he saw the Hound of the Baskervilles.'