E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
A snarling, churlish person, like a cynic. The Cynics were so called because Antisthens held his school in the gymnasium called Cynosargs, set apart for those who were not of pure Athenian blood. Cynosargs means white dog, and was so called because a white dog once carried away part of a victim which Diomeos was offering to Herculs. The sect was often called the Dog-sect; and the effigy over Diogns pillar was a dog, with this inscription: