[ London Times ]
This newspaper, most correctly known simply as The Times, began publication in 1785 and continues to this day.
The edition of July 5, 1838, carried a "found Newf" announcement (black and white):
FIVE POUNDS REWARD. — LOST, on the 3d of July instant, a large NEWFOUNDLAND DOG, black and white, white muzzle, and the tip of the tail white; answers to the name of Leo. Whoever will bring him to the porter of the Inner Temple shall receive the above REWARD. No further reward will be offered.