The Gloucestershire Old Spots (also "Gloucester, Gloucester Old Spot, Gloucestershire Old Spot or simply "Old Spots") is an English breed of pig which is predominantly white with black spots. It is named after the county of Gloucestershire. The Gloucestershire Old Spots pig is known for its docility, intelligence, and profligacy. Boars reach a mature weight of 600 lbs (272 kg) and sows 500 lbs (227 kg). The pigs are white with clearly defined black (not blue) spots. There must be at least one spot on the body to be accepted in the registry. The breed’s maternal skills enable it to raise large litters of piglets on pasture. Its disposition and self‑sufficiency should make it attractive for farmers raising pasture pigs and those who want to add pigs to diversified operations.
The Gloucestershire Old Spots (GOS) Breed Society was formed in 1913. The originators of that society called the breed 'Old' Spots because the pig had been known for as long as anyone could remember. The first pedigree records of pigs began in 1885, much later than it did for cattle, sheep and horses because the pig was a peasant's animal, a scavenger and was never highly regarded. No other pedigree spotted breed was recorded before 1913, so today's GOS is recognized as the oldest such breed in the world. From the British Pig Association: “Although if old paintings are to be trusted, there have been spotted pigs around for two or three centuries, the Gloucestershire Old Spots has only had pedigree status since the early 20th century."