[ Irving / A History of New-York ]
This work's only mention of Newfoundlands (metaphorical) occurs in Chapter 9:
Now so it happened, that among his officers was a sturdy veteran named Keldermeester, who had cherished, through a long life, a mop of hair not a little resembling the shag of a Newfoundland dog, terminating in a queue like the handle of a frying-pan, and queued so tightly to his head that his eyes and mouth generally stood ajar, and his eyebrows were drawn up to the top of his forehead.