A rare, rugged terrier of calm, witty charm.
Origin
Wales
Height
10.5 in (27 cm)
Weight
23–24 lb (10–11 kg)
Lifespan
12–14 years
Coat
Wiry, weatherproof double coat
Energy
Moderate
Overview
The Sealyham Terrier is a rare, low-slung white terrier developed in Wales to hunt badger, otter, and fox. Sturdy and powerful for its size, it combines classic terrier courage with a notably calm, mellow disposition.
Charming, alert, and affectionate, the Sealyham is a more laid-back terrier that bonds closely with its family and makes a good watchdog. It is spirited and a touch stubborn, with a droll, characterful personality all its own.
History
Developed in the 19th century at Sealyham House in Wales by Captain John Edwardes, the breed was bred as a tough working terrier for badger and otter. Once fashionable, it is now one of the rarer terrier breeds.
Where it comes from
Wales
Highlighted in the Sealyham Terrier's lineage color on the map.
Temperament
The Sealyham is confident, devoted, and calmer than many terriers, watchful with strangers and loyal to family. It is intelligent and independent with a prey drive, responding to patient, positive training and early socialization.
Health to watch
A hereditary eye condition where the lens dislocates occurs; a DNA test helps identify at-risk dogs.
Retinal dysplasia and other eye disorders occur; regular eye exams help catch them early.
The Sealyham is a fairly robust breed with a modest list of inherited concerns.
General breed tendencies, not a diagnosis. Every dog is an individual — pair this with regular veterinary care.
Care essentials
The wiry coat needs regular brushing and periodic hand-stripping or clipping to maintain its texture.
Moderate daily activity and play meet this calmer terrier's needs.
A prey drive means a secure yard and leashed walks help keep the Sealyham safe.
XPET builds each pet a digital twin — modeling their real biology instead of breed averages, so care stays personal.