Trivia: Tom Hanks is the first actor to play Walt Disney in a mainstream feature film.
Trivia: In the final scene from Walt Disney's office when P.L. Travers has arrived for the premiere you can spot a map of Florida with a marked area of where today's Walt Disney World is located. Walt Disney was indeed planning WDW in 1961 and it was in the early stages of development on the drawing board. Ultimately, Walt died before the new park opened. (01:50:40)
Answer: The dog is either a Skye terrier or a French Briard. Since it is white and has a long tail it is most likely a mixed breed, since the scene is supposed to be in Australia, it may be a mixed terrier and Australian sheep dog mix.