Brewer's: Dandie Dinmont
A jovial, true-hearted store-farmer, in Sir Walter Scott's Guy Mannering. Also a hardy hairy short-legged terrier.
“From this dog descended Davidson of Hyndlee's breed, the original Dandie-Dinmont.” T. Brown: Our Dogs, p.104.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894