Did Meriwhether Lewis took a pet on the expedition with him it's name was shannon if so what was it?

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 before he left Washington D.C. The captain 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. Lewis prised the dog "much for his docility and qualifications generally for my journey." 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.