The words Dog Breed Info with the letter D inside of a black paw print

The Purebred Sealyham Terrier

Information and Pictures

Close up front view - A black and white photo of a Sealyham Terrier is standing on a hardwood surface and the dog is looking up and to the right. The dog has longer hair on its snout that looks like a mustache and beard and wavy hair on its body with a big black nose.

Pilot the Sealyham Terrier— "Pilot was born on June 17th 2011 at Goodspice Kennel by Margery Good and Sarah Hawks. Her father is the infamous Charmin, 2009 Crufts Best in Show. She and I became best friends when she turned 9 months. We live in New York City's beautiful Upper West Side. Pilot's show career was brief but uniquely fast-tracked: within a few weeks, she won several national champions and returned home to me with flying colors. She carries gentle disposition and precious sense of humor. Her favorite trick is finding the busiest street corner and "sit pretty" minutes at a time, enjoying passerby's feedback: "Oh My God, this dog is sitting like a human being! This is SO adorable!! Can I take a picture?" Pilot is trained to fetch and floor mopping, among 12 other comments she performs at about 90% accuracy. Her favorite snack is raw/frozen chicken feet. She'll do anything to hear the freezer door open."


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The Sealyham Terrier is a strong, low to the ground dog. The head is long and broad in proportion with the body. The skull is slightly domed with a slight indent running down between the eyebrows joining with the muzzle. It has a moderate stop. The nose is black with large nostrils. The teeth meet in a scissors bite and the jaw is square. The oval, wide-set eyes are dark. The ears are wide, hanging down, folded forward and carried against the cheeks. The tail is carried high and is customarily docked. Note: docking tails is illegal in most parts of Europe. The wiry, weather-resistant, double coat is solid white, sometimes with lemon, tan or badger-colored markings on the head and ears.


The Sealyham is affectionate, loving, loyal, independent and spirited. It is a brave little dog. It has been descried as "the most beautiful union between cheerfulness and courage." Sealyhams are not as rowdy as some of the other terrier breeds. They are somewhat reserved with strangers, fairly independent and generally good with other pets. Be sure you socialize this dog well and be his pack leader. Do not allow this sweet dog to develop Small Dog Syndrome, human induced behaviors, where the dog believes he is pack leader to humans. This can lead to many behavior problems, including, but not limited to separation anxiety, dog-aggression and obsessive barking. If this dog sees himself a stronger minded then the humans around him he will become stubborn, as he will believe he needs to make up his own rules. This breed needs an owner who has good human to canine communication skills and can be calm but consistently firm with the dog. The negative traits brought by allowing your dog to be pack leader are not breed traits, but behaviors which are the result of how the human treats the dog. This breed is a little difficult to train, but they can hunt, track and are good watchdogs. Sealyhams are good at catching mice and rats. They are best with older children who are considerate of dogs, simply because most small dogs are treated in such a way that they develop varying degrees of small dog syndrome. Sealyhams who have 100% pack leaders, receiving rules to follow, limits to what they are allowed to do and daily pack walks can be good with all children. Sealyhams are "pack" dogs. They appreciate being a key part of a family and welcome companionship with other dogs.

Height, Weight

Height: Not more than 12 inches (30 cm)
Weight: Maximum 20 pounds (9 kg)

Health Problems

Fairly healthy.

Living Conditions

Good for apartment living. They are relatively inactive indoors and will do okay without a yard. Prefer cool weather.


This breed needs a daily walk. Play will take care of a lot of their exercise needs, however, as with all breeds, play will not fulfill their primal instinct to walk. Dogs that do not get to go on daily walks are more likely to display behavior problems. They will also enjoy a good romp in a safe, open area off lead, such as a large, fenced-in yard. The breed is a low-energy dog that makes a good walking companion. The overriding characteristic about Sealyhams is that they are low energy, couch potatoes. They are not "busy," not "active" and therefore make a low-key companion.

Life Expectancy

About 15 years

Litter Size

About 4-6 puppies


Professional trimming or stripping is needed. They have a medium-long coat and their tails are customarily docked. They shed little to no hair.


The Sealyham was developed in Wales in the middle of the 19th century by Captain John Edwards. He crossed the Dandie Dinmont Terrier, West Highland White Terrier, Corgi, Wirehaired Fox Terrier and the Bull Terrier to produce the Sealyham we know today. The dogs were developed to go to ground after badger, fox and otter. The white coat helped the hunters distinguish the dog from the pray. The Sealyham Terrier was recognized by the AKC in 1911, and the American Sealyham Terrier Club was founded in 1913.

  • ACA = American Canine Association Inc.
  • ACR = American Canine Registry
  • AKC = American Kennel Club
  • ANKC = Australian National Kennel Club
  • APRI = American Pet Registry, Inc.
  • CET = Club Español de Terriers (Spanish Terrier Club)
  • CKC = Canadian Kennel Club
  • CKC = Continental Kennel Club
  • DRA = Dog Registry of America, Inc.
  • FCI = Fédération Cynologique Internationale
  • KCGB = Kennel Club of Great Britain
  • NAPR = North American Purebred Registry, Inc.
  • NKC = National Kennel Club
  • NZKC = New Zealand Kennel Club
A short legged, white Sealyham Terrier dog is sitting on a its hind legs in a begging pose on top of a rug looking up.

Pilot the Sealyham Terrier sitting pretty

A black and white photo of a Sealyham Terrier dog that is laying on its right side on a carpet. It has a wavy coat and one of its big ears is laying across the floor.

Pilot the Sealyham Terrier taking a nap

Side view - A white Sealyham Terrier dog is standing on snow and it is looking forward. It has longer hair on its face and ears that fold over to the front in a v-shape.

Jimnic Chamonix aka Smilla the Sealyham Terrier at about 1 year old

The left side of a white Sealyham Terrier dog that is standing on a floor mat in a show stack. A person is touching its tail to pose it. There is an award placed in front of the dog.

"Rosie (Champion Thunder Road's Dancer's Image) at 1 1/2 years old, when she got her very first point when handled by me and only got better from there! She finished her championship within two months of being out. Rosie is loving, sweet, cuddly, playful and independent all in one. She likes walks, playing with her "cousins" (an Airedale, two Lakeland Terriers, a rather large calico cat, and several Sealyhams), playing with her friends (a German Shorthaired Pointer, a black Lab, a Lab mix, a yellow Lab, a Dachshund and a Beagle), dog shows and seeing her handler friends, playing in the snow, going to see her real doggie daddy and mommy, seeing her breeder, seeing her groomer, cookies, carrots, playing tugger and fetch. I think Rosie is very balanced. She is friendly and socialized and sweet. She can be trusted off the leash and is friendly with all other animals. She has never been aggressive and if she gets out of control we have used many of Cesar Millan's techniques. We watch him all the time!"

A low to the ground, white Sealyham Terrier dog standing outside in snow looking to the left.

Jimnic Chamonix aka Smilla the Sealyham Terrier at about 1 year old

Front view - Two white Sealyham Terriers are sitting in grass and they are looking to the left. The dog on the rights mouth is open and tongue is sticking out. The dogs have longer hair on their faces.

Photo courtesy of Stina the Sealyham Terrier

A short, white Sealyham Terrier is standing across a carpeted surface and it is looking forward. There is another Sealyham Terrier in the background that is standing at a doorway.

Photo courtesy of Stina the Sealyham Terrier

A litter of three Sealyham Terrier puppies are standing on a carpet and they are sniffing each other. One puppy has black around one of its eyes with a white body, the other has a black spot next to its ear with a white body and the other puppy is pure white.

Photo courtesy of Stina the Sealyham Terrier

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