The name of this Terrier comes from the Sealyham estate in Pembrokeshire and its development is due to the English officer John Edwards, who through different crossbreedings between Basset, Bullterrier, Fox Terrier, Dandie Dinmont Terrier and White West Heighland obtained the present specimen. It is more widely spread in England and South Africa.
It is a small sized, brawny, even powerful dog. The body is slender and of medium length. The head is rectangular with a square muzzle with a rich mustache and beard. The eyes are round, small, dark and the eyebrows are thick. It has a big, black nose. The ears are medium-sized, round ended, V-shaped and bent over the cheeks. The tail is docked short and kept high. The furt is double-layered, with a soft, dense inner layer, resistant to weather changes and an outer layer with rough, wiry, long hair, that can be entirely white or with yellowish, brown, grey, fawn patches on the head and/or ears.
It is a smart, brave, active dog energetical outdoors, but quiet indoors, well-balanced, hardworking, sometimes stubborn and playful. It is very loyal and attached to the familly. It is tolerant with children and cautious with strangers. If socialized with other dogs and other animals from an early age it should have no problems.
The fur requires frequent brushing and combing and also trimming by an experienced person.
It is a dog resistant to weather changes and can well adapt both to life outdoors and indoors, with a patient master, experienced in raising dogs. It needs socialization and training.
It is an intelligent dog that understands easily therefore the training is not very difficult, even if the dog is a bit stubborn and wants to have its way. With a firm, consistent, well-balanced training, without being too hars one can get good results.
It is a good small animal hunting dog, a good watchdog and a pleasant companion.