Das Originalbuch stammt von 1942.
Timmy wird dort als braungrauer, strubbeliger halbhoher Mischling beschrieben den George im Moor fand.

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My line of thoughts about dogs is analogous. A dog reflects the family life. Whoever saw a frisky dog in a gloomy family, or a sad dog in a happy one? Snarling people have snarling dogs, dangerous people have dangerous ones. And their passing moods may reflect the passing moods of others.~ Sherlock Holmes in "The Creeping Man" (Deutscher Titel: "Der Mann mit dem geduckten Gang) von Sir Arthur Conan Doyle