What was the dog's name that came with Lewis and Clark?

Lewis' dog, of the Lewis and Clark expedition, was of the Newfoundland breed. Historians differ on whether the dog was named "Seaman" or "Scannon", depending on how you read Lewis' writing. Lewis purchased him for some $20 from a riverboat captain who had won him and his mother playing cards. Seaman (or Scannon) accompanied Lewis all the way to the Pacific Ocean and returned with him to St. Louis. The Newfoundland is a big dog with a kind personality. This particular breed is a working dog, especially used in the sea fishing industry. These types of dogs would pull in the fish loaded nets.