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Dandy Doo was the pet dog of millionaire Mr. Dimwit, who left all his money to him. He was also the great-grandfather of Scooby-Doo, on the Doo side of the family.
He looked like Scooby-Doo with side whiskers and a beard.
He died before the gang could meet him, so not much is known of his personality. He seems to have had poor judgement in keeping on his house staff.
Scooby Doo... Where Are You! (Charlton Comics)
He died of natural causes, and his criminal gang of caretakers tried to get Scooby-Doo as a replacement for him to continue their meal ticket. (The Four Flushers)