Snowy is Tintin's Wire Fox Terrier dog and a protagonist of the series. The bond between the two is significantly strong, as they have saved each other's lives numerous times throughout the series. Snowy seldom "speaks", but is instead seen thinking. When we are in Snowy's mind, it generally consists of a debate between a "good" and "bad" version of Snowy's conscience. This usually ends up in catastrophe for Snowy, as usually the "wrong" choice is made. Finally, note the interesting evolution of the character over the albums, lost the gift of thought expressed in words to images and content become virtually silent. Snowy is clearly able to communicate with Tintin in the series. Like Captain Haddock, Snowy is quite fond of Loch Lomond brand whisky. Snowy rarely leaves Tintin's side intentionally, only doing so when the two have been forcefully separated. Unfailingly, the pairs are always reunited at the end of the adventure.
Throughout the series, Snowy is Tintin's sidekick and companion on journeys. Along with Tintin he is the only character to appear in all of the comic albums. In the debut album Tintin in the Land of the Soviets, Snowy is a source of comic relief. Throughout the first eight stories Snowy is the series' co-star, able to understand human language, and communicates with speech bubbles. His verbal responses to various situations include jokes, expressions of fright, and pleas to Tintin to exercise caution. In the early albums he takes an interest in mechanics and geography; in Tintin in the Congo, he makes biblical references. As a dog, he also sniffs, tracks, chases, and bites.
The character of Snowy evolved through the course of the Tintin series. In early works he exchanges dialog with other characters, including animals, and provides a running commentary on the situation. His character then became affected by the introduction of Captain Haddock in The Crab with the Golden Claws. Before Haddock's appearance, Snowy was the source of dry and cynical side-commentary, which balanced out Tintin's constantly positive, optimistic perspective. When Haddock entered the series, the Captain took over the role of the cynic, and Snowy gradually shifted into a more light-hearted role, having dialog only with Tintin.
Snowy is portrayed as brave and is often fearless, even against much larger creatures when Tintin is threatened. He has no qualms attacking animals larger than himself, which consistently leads to him being sacrificed by humans, although he is always rescued. These can be seen in Cigars of the Pharaoh and The Broken Ear. He repeatedly frees Tintin from captivity, saving him from dangerous situations, and will sometimes identify a villain before Tintin. The Black Island and The Shooting Star show his only fear of arachnophobia. Snowy is loyal to Tintin and always wishes to stay by his master's side: in a scene in The Shooting Star when Tintin temporarily abandoned him, Snowy was inconsolable.
Snowy loves whiskey, and occasionally gets drunk (as occurred in Tintin in the Land of the Soviets, Tintin in Tibet and Tintin and the Picaros. His appetite for food is the basis for several short, comical sequences. The dog's biggest lust is for bones. This is repeatedly the centre of moral dilemmas, as Snowy has to decide between carrying out important tasks, such as carrying an SOS message, and picking up a bone, as evidenced in King Ottokar's Sceptre. Snowy indulges in rowdy behaviour chasing the Siamese cat at Marlinspike Hall until the two become friends at the end of The Calculus Affair. Snowy often adds to the story in notable ways. For instance, Snowy is the only character in Flight 714 to Sydney to escape mass hypnosis and to know of their abduction by aliens.
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