The Spunky Sealyham Terrier

descriptive textDog breed info
Sealyham Terrier
Weight: 18 — 22 lbs
Height: 10” — 12”
AKC Rank 2008 #150
Lifespan: 12—14 yrs
Group Terrier
Origin: Wales

Dog Breed Info—The Sealyham Terrier

Breed Overview

Origin: 1800’s. Original function: Hunting badger, otter. Today: Earthdog trials. Colors: All white or with lemon, or tan marking.

The Sealyham Terriar originated in Wales in the mid 1900’s and was produced by a Capt. John Edwards who lived in Sealyham, Wales. Captain Edwards cross bred dogs through the late 1900’s and it is thought, though somewhat clouded as to the exact ones, some hounds, the Westie, Dandy Dinmont Terrier along with Corgi’s and possibly the Wirehaired Fox Terrier. The object was to come up with a courageous dog that could hunt badger. The result was a plucky terrier that became a worthy dog in the show ring as well as for the hunt. The dog could deal with not only badgers, but otter and fox too. The Sealy entered the show ring in 1903. The American Kennel Club registered the breed in 1911. Demand for these dogs grew but not so much in the States where the dog is till rare today.


The Sealyham Terrier is not the easiest dog to train. Some have a stubborn streak. Use clicker training and positive reinforcement. They respond to repetitive, consistent, firm but kind and very patient training. Or, use the Cesar Millan method as that is another excellent way of training these dogs.

Crate Training

Want to crate train your Sealyham? It's easy and if you're interested, take a look and you'll see what to do. Crate training your puppy will save many headaches and problems.

Potty Training

The Sealyham Terrier puppy isn’t too hard to house train, potty train, toilet train, housebreak or whatever you want to call it. They learn pretty fast. If you have a puppy, decide if you want to crate or paper potty train it. For the best results, we have a page at Crate vs Paper Potty Training which will help you decide and from there you can get all the information you need to get the job done. Always praise the pup profusely when she goes potty in the RIGHT PLACE so she knows she has done a good thing.

If you have an older dog, take the dog outside every two hours until she gets the idea which door leads to her potty area. Older dogs catch on to the potty or housebreaking pretty fast once they are shown what to do.


The Sealyham, from Wales, is a plucky, happy, playful little house pet that loves attention, digging and exploring. It is friendly and outgoing. This breed can be quite independent and must have a lot of socializing starting at 4 or 5 weeks of age and continued on. The Sealy must be in a home with alpha-dog leadership so it doesn’t try to take over the running of the household.

If the Sealyham Terrier is properly exercised and handled by an alpha leader, it is a wonderful house pet, loyal, affectionate, playful quiet and a real couch potato. The dog is not highly active indoors and his exercise needs are met with a daily walk or two and some play time in the yard or park. This dog does pretty well with children, especially older, well-mannered kids and shed very little to none. They are somewhat wary of strangers and will bark their heads off when someone comes to the door or window. As a qualified terrier, the Sealy is good at catching mice and digging holes They are great little family pets.

If you happen to get a Glen Terrier with a separation anxiety problem, that can be dealt with by investing a few hours of work on your part and some "tough love."


Friendly Toward Other Dogs

This is a pack dog when hunting and generally gets along with most dogs.

Friendly Toward Other Pets

Generally okay with other pets. Introduce to cats slowly and to dogs on common ground such as a walk in the park.

Friendly Toward Strangers

Reserved and wary with strangers but devoted to family.


Somewhat playful. Not over-exuberant, but does love to have fun.


Fairly affectionate, certainly devoted to family and a little :”couch potato.”

Good with children?

Yes, especially older, well-mannered kids 6 or 7 and up. The Sealy isn’t tolerant of excessive pulling, poking and pushing or screaming and screeching so very small children might not be good. It the dog has been well socialized, he should would out for older kids.

Good with Seniors over 65?

Yes. The Sealyham is a good choice for the senior. They are low key, playful and affectionate enough, good watchdogs, devoted to family and are easy to care for, being couch potatoes at heart. A senior would enjoy such a friend.

Living environment

Apartment, flat, condo, farm or ranch all good. Does not need a yard, if relatively inactive indoors but does need a cool climate.

Energy level

Low. Always up for a game or some walking and play, but that’s about all.

Exercise needs, daily

One or two short to moderate walks daily and a game ibn the yard or park will do it. The dog MUST walk to fulfills his emotional needs. After the exercise, he’s content to be a couch potato.

Keep the dog on leash unless in a secure area, as the dog might pick up a scent and go chasing it.


Good watchdog.

Guard dog

No, not a serious guardian. He will bark if threatened.


Shedding is next to none.. A likely candidate for allergy sufferers.


Comb or brush every other day. Clipping and shaping by a groomer is needed every 8 to 12 weeks.

Sealyham Terrier Breeders

In the event you decide to go looking for Sealyham Terrier puppies, be SURE to find reputable breeders that really know what they are doing. Be sure the puppy has been VERY well socialized and started in obedience training. We don't offer a breeder referral page on this site, but if you check the web, there are plenty out there.
Sealyham Terrier Breeders with puppies for sale. NOTE: As I am writing this, the site is showing only 5 breeders worldwide. If you need more, go online and search for Sealyham Terrier Breeders or Puppies.

Dog Health Issues For Sealyham Terriers
Below: The dog illness / illnesses or medical problems listed for the Sealy by various vets.

This is basically a healthy breed. These are the dog illness and medical problems this breed is prone to that have been listed by various veterinarians at different times over the past decade or so and some pertain to puppies and very young dogs that a breeder would deal with.

The information contained herein has been gathered from numerous books by veterinarians and is intended as general information only. Every dog and situation is different. You must see your vet. Our information is for general interest only and not intended to replace the advice provided by your own veterinarian.

  • Progressive Retinal Atrophy—(PRA) An inherited, untreatable disease of the retina affecting both eyes causing blindness. It’s in the genes of the dog and is not painful. Starts with night blindness and progresses as the retina gradually deteriorates.

  • Deafness—Hereditary or caused by: Excessive loud noise, Intolerance to anesthesia, drug toxicity, and Otitis (middle ear infection), In some cases, one ear can have no hearing from birth and the other ear can be losing the ability to hear over time, undetected, then suddenly one morning the hearing is totally gone. There is no reversing once that happens.

  • Retinal dysplasia—Caused by trauma, hereditary or damage from an infection.. Abnormal development of the retina with folds in the outer layers.. The folds are small and may not bother the dog, however, larger obstructions can lead to blindness. Retinal dysplasia is a congenital problem that does not necessarily worsen with age.

  • Lens luxation—Hereditary. Weak fibers holding the lens of the eye allow the lens to dislocate. The eye can not focus. This leads to painful, red eyes that tear a lot and can lead to Uveitis or Glaucoma if not treated right away. If detected early, surgery and medication might solve the problem.

  • Skin allergies.

Other health problems could occur with your Sealyham Terrier. If you notice any problems with your dog, take it to the vet immediately. This website is for general information only and is not intended to, in any way, be a medical guide.


Return To Dog Breeds