Died in August 1901
Previous owner: The Marquis of Londonderry, Bressay, Shetland (1890)
Came into Lord Londonderry’s possession as a colt and was probably the important foundation sire of the breed.

Of Jack's parentage nothing is known. It is probable, however, that he was himself an inbred animal; for close inbreeding is still, and always has been, the general practice among pony breeders in Shetland, probably rather through necessity or carelessness than as the result of deliberate intention; and Jack's prepotency as a sire lends colour to this supposition.
He was a black, 40 inches high, and the only portrait of him which we possess shows him to have been a short-backed and close-coupled horse of remarkable bone and substance, finely proportioned, and with a bold and upright carriage. He must have had a sound and vigorous constitution, since he lived to the age of thirty, and was at stud to the end of his life.