What was the name of the dog in the Walt Disney film "Peter Pan"?

"Peter Pan" is a 1953 American animated musical fantasy adventure-drama produced by Walt Disney Productions and was based on the 1904 play "Peter Pan", or "The Boy Who Wouldn't Grow Up" by J. M. Barrie. Directed by Clyde Geronimi, Hamilton Luske and Wilfred Jackson, it is the 14th Disney animated feature film and was originally released on February 5, 1953 by RKO Radio Pictures.

In London, England, circa 1900, George and Mary Darling's preparations to attend a party are disrupted by the antics of their boys, John and Michael, acting out a story about Peter Pan and the pirates that was told to them by their older sister, Wendy. George, who is fed up with the stories, declares that Wendy has gotten too old to continue staying in the nursery with the boys. That night, Wendy and the boys are visited in the nursery by Peter Pan himself, who teaches them to fly with the help of his pixie friend, Tinker Bell, and takes them with him to the island of Never Land.

Nana is the Darlings' nursemaid, a St. Bernard dog (originally a Newfoundland dog). She is an unnatural dog, taking care of the Darling children and cleaning up after their continuous messes. She is very efficient at her work, and possesses much tolerance for the messes. She is the family's favorite pet, so much so that separating her from the children for one night was considered a great punishment. She only barks and is musically represented by the bassoon.