Black Dog is a mysterious character we meet in episode one of Treasure Island.  While Billy Bones is staying at the Admiral Benbow Inn, Black Dog pays him a visit one night.  Here's Shugri's character description of Black Dog.

                                                             Black Dog

Black Dog is violent he had started a fight with Billy Bones. Black Dog has left over food in his black bushy beard. Unfortunately Black Dog has lost his index finger and middle finger. He is also very lanky (lanky means skinny) and tall.

Rumour has it that Black Dog  lost his 2 fingers because a shark bit them off. People say that Black Dog’s name ends with dog and some dogs are violent so that’s how he became violent. But we just don’t know if it is true or not.