They were the footprints of a gigantic hound! (#10)

"But one false statement was made by Barrymore at the inquest. He said that there were no traces upon the ground round the body. He did not observe any. But I did—some little distance off, but fresh and clear."
"Footprints?"
"Footprints."
"A man's or a woman's?"
Dr. Mortimer looked strangely at us for an instant, and his voice sank almost to a whisper as he answered:
"Mr. Holmes, they were the footprints of a gigantic hound!"
The Hound of the Baskervilles, ch. 2 (1902)
Dr. Mortimer in The Hound of the Baskervilles (Doubleday p. 679)