Atlas

Atlas was the pet dog of Dapper Jack Rogers in the 1800's, at least until 1867.

Physical appearance
Atlas was presumably a Great Dane, with brown fur; identical to Scooby-Doo. When it was believed he was evil, Shaggy Rogers pictured him with a moustache.

Personality
Atlas was kind and considerate, just like his master. A book Sheriff Rufus Carmichael wrote about Dapper Jack made him and Atlas look the complete opposite.

Early life
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Scooby-Doo! Shaggy's Showdown
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Appearances

 * DTV26. (flashback, no lines)