Sealyham Terrier


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The sealyham terrier or ‘sealy’ is a fearless and energetic dog. A great working dog and good hunter. It is also an excellent playful, loyal and affectionate companion animal. The sealy was the result of a crossbreeding of different terriers looking for a robust and small dog ideal for hunting.

Height: 12.25 inches
Weight: 17.6- 19.8 Pounds
Fur: Average length
Life expectancy: 12 years
Activity Level: Average
Country of origin: United Kingdom
Orientative Price: 1100-1600 $

Physical Appearance

  • Weight. Male individuals can weigh up to 20 lbs, while female individuals can reach up to 18.7 lbs.
  • Height. Their height never exceeds 12.2 inches at the withers.
  • Coat. The outer layer of their coat is long and tough, known as wirehair. The inner layer is durable.
  • Colors. They come in pure white or with spots on their ears and head in various colors like lemon, blue, chestnut, badger, and even black.
  • General Build. This breed is small but robust. They have an oval-shaped, active build with agile and powerful movement. Wide and deep chest. Short and muscular limbs.
  • Broad head between the ears. Black nose. Square and elongated muzzle. Medium-sized ears on the sides of the cheeks. Round, dark-colored eyes. Untrimmed tail: medium in length, wider at the base, and tapering at the tip, carried erect.


Courageous, friendly, energetic, and dynamic in character, the Sealyham Terrier is an excellent and affectionate companion dog that shows loyalty and affection to its owners.

They can also be trained for work as they are excellent ratting dogs. They adapt well to any environment but can be quite a barker.

They love to be the center of attention and engage in playful antics. They have a great sense of humor!


Guard Dog. They make good guard dogs and naturally distrust strangers, always staying alert, so the Sealyham will defend its territory with loud barks.

Barking Tendency. They tend to be vocal, so the Sealyham can be somewhat noisy.

Sealyham Terrier in an Apartment. This breed adapts perfectly to both city and country living. They only need to meet their daily exercise requirements.

Training and Obedience. The Sealyham is an intelligent, lively dog eager to learn and please. Training is usually not difficult due to these qualities. Remember to use positive reinforcement in your training. You should be a kind yet firm instructor, as the Sealyham can be a bit stubborn.

Sealyham Terrier with Children. With proper socialization, they tend to be friendly and playful with children. In the case of very young children, it’s advisable to have an adult present, as the dog’s energy and exuberance could accidentally harm them.

Sealyham Terrier with Other Pets. They can develop good relationships with other pets as long as they are properly socialized from a young age and trained to coexist peacefully. Coexistence is usually easier when the pets are raised together.

Adaptation to Solitude. The small Sealyham enjoys being with its owners but can tolerate solitude well, as it is a fairly balanced breed. It’s ideal for the dog to get some exercise before being left alone.


Daily Walks and Activity. The Sealyham needs to expend its energy, requiring at least one hour of daily exercise.

They love vigorous walks, games, free running in a secure area, and canine sports.

Coat Care. Frequent brushing will keep their coat clean, shiny, and free from knots. Ideally, brush them daily or at least three times a week.

To maintain their pure white color, regular cleaning of the area around the eyes and the beard is necessary to prevent yellowing of the fur.

Bathing them every three weeks or once a month with a shampoo designed for white coats is recommended.

Visit a professional canine groomer two or three times a year to keep their coat healthy.

Pros and Cons

Advantages of Sealyham Terrier:

  • The Sealyham is affectionate and loyal to its owners. It’s fun and dynamic.
  • It makes a good guard dog.
  • It adapts to any environment, be it rural or urban.
  • Tolerates solitude well.
  • Can excel in canine sports.

Disadvantages of Sealyham Terrier:

  • The Kennel Club has categorized the Sealyham as a “vulnerable native breed,” making it difficult to find.
  • Tends to be a noisy and vocal dog.
  • Not recommended for very young children.
  • Requires at least one hour of exercise per day.
  • Needs regular coat maintenance.


According to the Sealyham Terrier Club, there are two common health issues in the breed:

  • Canine degenerative myelopathy (spinal cord degeneration that can lead to limb paralysis).
  • Lens luxation (lens dysfunction that can lead to glaucoma or blindness).

Both are hereditary diseases that can be prevented through DNA testing. Breeders should ensure that breeding is done with healthy individuals to prevent these hereditary diseases. Otherwise, the Sealyham is a robust and healthy breed.

History and Origin

The Sealyham Terrier was created in Britain by breeding various terriers. Captain John Tucker Edwards, on his estate in Wales called Sealyham, was responsible for developing the breed, which gave the breed its name.

The goal in breeding was to create a robust and small dog for underground and small-game hunting, including otters and badgers.

The Sealyham excelled in its hunting duties and was quite popular in the early 20th century. Today, it is a cheerful, energetic companion dog and a good guard dog.

The Kennel Club officially recognized the breed in 1911.

The FCI (Federación Cinológica Internacional) definitively recognized the breed in October 1954 and published the latest official standard in March 2009; it was classified in Group 3: Terriers, Section 2: Small Terriers.