Diamond (dog)

Diamond appears in retrospective anecdotes about Isaac Newton circulating in the 19th century and later. In the canonical telling, Diamond was Newton's favourite dog who upset a candle in Newton's study, setting fire to manuscripts containing notes on experiments accumulated over some twenty years. The tale appears in biographical works such as David Brewster's The Life of Sir Isaac Newton (1833) and is used by literary figures (Walter Scott in The Antiquary, and Thomas Carlyle in his essays) as an emblematic image. At least one modern summary characterizes the story as largely apocryphal and records alternative explanations (for example, a gust of wind through an open window) and even doubts that Newton kept pets.

The available sources do not supply any reliable physical description of Diamond; no contemporaneous primary details about size, color, breed, or markings are provided in the cited material. References to the dog in the 19th‑century retellings and later summaries present Diamond only by name and role in the anecdote rather than by appearance.

Diamond is not described as possessing supernatural powers in the sources; the animal's attributed 'ability' is simply the accidental upsetting of a candle that (in the anecdote) led to a fire and the loss of Newton's manuscripts. Later authors also use Diamond facetiously as a literary device—an example being an attributed quip that the dog 'discovered two theorems in a single morning' (with humorous commentary about their defects). The story is treated as literary embellishment and is disputed by some historians, who provide alternate causes for the loss of papers or question whether Newton kept pets at all.