Why Was Sherlock Holmes Considered The Great Hound?

As of yesterday, May 2nd, 1898, Sherlock Holmes stepped into City Hall to answer a few questions about his most recent case.
He revealed that after the death of Sir Charles, another murder attempt took place, directed toward Sir Henry Baskerville, the supposed only heir of Sir Charles.
“Things took an unexpected turn when the killer mistakenly killed the notorious Selden rather than Sir Henry,” stated Holmes.
After several interviews and problem solving, Holmes managed to convict the killer who ended up being none other than ‘innocent’ Jack Stapleton.
Holmes also determined that Stapleton was, in fact, the son of Sir Robert, who was presumed dead in Southern America years prior.
This case will forever leave a bad feeling for the people of Dartmoor, Devonshire, as the legend of the great hound will forever scar and frighten the residents. The case arose due to Sir Charles’ untimely death, explained simply by a heart attack. He had been progressing through an ordinary day, when he encountered an enormous hound, causing him to die on the spot.
However, things started going wrong immediately after he arrived in London. When Sir Henry was staying at his hotel before moving into Baskerville Hall, one of his boots went missing. This may not seem suspicious; however, it got much stranger when Sir Henry received a letter reading, “If you value your life or your reason keep away from the moor.” Sir Henry didn’t think much of this at first, but he took note of it as he headed for Baskerville Hall, accompanied by Dr