The Sealyham Terrier is a dog breed, one of many Terrier breeds. The Sealyham Terrier originates from Wales and was bred by crossing Basset Hounds, Bull Terriers, the Fox Terrier, the West Highland White Terrier, and the Dandie Dinmont Terrier.

The Sealyham Terrier derives its name from Sealyham, Haverfordwest, Wales, the estate of Captain John Edwards, who developed a strain of dogs noted for their prowess in quarrying small game. He crossed the various breeds and tested the offspring, culling those who did not prove game.

Temperament
The Sealyham Terrier is an intelligent and charming dog, although it can be stubborn and very terrier-like at times.

History
The first Sealyham Terrier's club was created in 1908 and the breed was officially recognised in 1910. The Sealyham Terrier was recognized by the United Kennel Club in 1919. Sealyham Terriers are today found mainly in the UK and South Africa. The Sealyham was once one of the more popular terriers and one of the best known Welsh breeds. Today, however, it is distinctly rare considered by the (British) Kennel Club as amongst the most endangered native breeds. The Corgi is without doubt the best known Welsh dog breed today aside from the only dog with Welsh in it's name, the Welsh Terrier.

Colour
All white or white with lemon, brown, blue or badger pied markings on head and ears. Much black and heavy ticking undesirable.

Size
Ideal weight Dogs approx. 9 kg (20 lbs)
Bitches approx. 8.2 kg (18 lbs)
Height: should not exceed 31 cms (12 ins) at shoulder.
General conformation, overall balance, type and substance are main criteria.