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From an 1898 dictionary of phrase and fable:
DOG in phrases:
A dog in a doublet. - A bold, resolute fellow. In Germany and Flanders the boldest dogs were employed for hunting the wild boar, and these dogs were dressed in a kind of buff doublet buttoned to their bodies. Rubens and Sneyders have represented several in their pictures. A false friend is called a dog in one’s doublet.
Between dog and wolf. - The hour of dusk. “Entre chien et loup.”
St. Roch and his dog. - Two inseparables. “Toby and his dog.” One is never seen without the other.
They lead a cat and dog life. - Always quarrelling.
To lead the life of a dog. - To live a wretched life, or a life of debauchery.
- E. Cobham Brewer 1810–1897. Dictionary of Phrase and Fable. 1898.