In Peter Jackson’s The Adventures of Tintin, Tintin’s dog is named Snowy.
Snowy is Tintin’s loyal white wire fox terrier and one of the best-known characters from Hergé’s comic books. He often helps Tintin investigate mysteries, notices dangers before his human companion, and provides comic relief through his fondness for food and occasional mischief.
The 2011 film adapts elements from three Tintin adventures: The Crab with the Golden Claws, The Secret of the Unicorn, and Red Rackham’s Treasure. Steven Spielberg directed the film, while Peter Jackson served as a producer through his company WingNut Films. Jamie Bell voiced and performed Tintin using motion capture, and Andy Serkis played Captain Haddock.
Snowy is called Milou in the original French editions. That name is also used in several other countries, so international viewers may encounter both names. The film’s English-language version uses Snowy, making it the canonical answer for this question.