From which country does the Sealyham Terrier breed originate?

The Sealyham Terrier (Welsh: Daeargi Sealyham) was developed between 1850 and 1891 and is a rare Welsh breed of small to medium-sized terrier. It originated in Wales as a working dog and is principally a white-bodied, rough-coated breed, developed by Captain John Edwardes at Sealyham House, Pembrokeshire.

Originally the breed was used for pest control, to hunt small game, and to eliminate vermin. The Welsh Corgi, Fox Terrier (Wire), and the now extinct English White Terrier provided the mixture for the Sealyham Terrier. Edwardes did not keep detailed records of breeds which were used in the entirety which he used to create Sealyham Terrier. He wanted a small white dog with a strong jaw and a wiry coat. The white coat was particularly prized, as it meant that the hunter in the field could distinguish the dogs from the quarry.

Following WWI, it surged in popularity and was associated with Hollywood stars and members of the British Royal Family. Its numbers have dropped significantly since then, with the breed listed as a Vulnerable Native Breed by the Kennel Club. This decline has been blamed on an influx of foreign and designer breeds, and the Sealyham's reduced usefulness as a working dog.

Princess Margaret owned a Sealyham as a pet called Pippin in the 1950's. The species were also owned by Gary Cooper, Elizabeth Taylor and Bette Davis. Sir Alfred Hitchcock used his two dogs, Geoffrey and Stanley in a scene in the film "The Birds".