Sealyham Terrier
西里漢㹴
Updated 2026-09-09
At a glance
The Sealyham Terrier is a sturdy, low-slung, predominantly white Welsh terrier developed in the mid-1800s to work alongside Otterhounds and go to ground after badger and fox, and now a vulnerable native breed. Brave and spirited but less spiky than smaller terriers, it is outgoing, funny, affectionate and trainable if a bit stubborn, with a big-dog bark that makes it an excellent watchdog, and it adapts to city or country life. It can overheat in hot, humid weather, so exercise early and late; the non-shedding coat needs combing every two or three days and stripping or clipping.
Facts
| Size | Medium |
|---|---|
| Height | 27cm |
| Weight | 10–11kg |
| Life expectancy | 12–14years |
| Breed group | AKC: terrier FCI: 3 |
| Role | Terrier |
| Coat | Wire coat |
| Shedding | 3/ 5 |
| Exercise | 30–90min/day |
| Can be left alone | up to 3 hours |
| Companionship need | 5/ 5 |
| Trainability | 4/ 5 |
| Barking | 4/ 5 |
| Good with children | 3/ 5 |
| Good with other dogs | 3/ 5 |
| Heat tolerance | 2/ 5 |
| Cold tolerance | 4/ 5 |
Health
This page is general information compiled from published sources. It is not veterinary, legal or purchase advice. Dogs vary within a breed — talk to a vet or a reputable breeder about the dog in front of you.
Health notes are not veterinary advice. Conditions listed are those reported for the breed, not a diagnosis of any dog. Always consult a veterinarian.
Inherited eye conditions
Various inherited eye conditions are reported in the breed; annual eye examinations by a veterinary ophthalmologist are recommended for breeding stock. Ask your vet about eye screening.
Skin and allergy problems
Skin problems and allergies are commonly reported in the breed. Ask your vet if you notice itching, redness or recurring ear/skin infections.
Ear infections
Recurring ear infections are commonly reported, particularly in drop-eared dogs. Ask your vet how to check and clean the ears.
Primary lens luxation (PLL)
The parent club names primary lens luxation, along with retinal dysplasia, as an eye condition the breed is prone to; a DNA test and regular eye examinations are available. Ask your vet urgently if an eye becomes cloudy, red or painful, and your breeder about the parents' PLL status.
Congenital deafness
The parent club notes that Sealyhams are sometimes deaf and recommends hearing (BAER) testing. Ask your breeder whether the puppy has been hearing-tested.
Behaviour
Outgoing, funny — with a big-dog bark
The CKC describes an outgoing, friendly dog that is nonetheless a good watchdog with a big-dog bark to discourage intruders, easily trained but inventive; keen and alert, a size that fits most households and one that thoroughly enjoys a daily walk. The AKC adds that Sealys are cute, funny, affectionate and trainable if a bit stubborn, with a sly sense of humour.
Firm but not harsh; watch the heat and the food bowl
The AKC says Sealys need a firm but not harsh training technique, early socialisation with a wide range of dogs, people and places to discourage dog aggression later, and prompt correction of food guarding, which the breed can show. They love to run in a safely enclosed area but can overheat in hot, humid weather, so exercise is best in the early morning and evening.
Energy and exercise
Energy level is rated 3/5 (moderate) on the AKC breed-trait chart. The Royal Kennel Club puts its exercise need at "up to 1 hour per day".
Training and barking
AKC trait chart: trainability 4/5, barking level 4/5. Individual dogs vary; early socialisation and reward-based training are recommended for every breed.
Official guidance
Summaries of official documents are ours; the source is linked. Breed standards, laws and licensing rules change — check the issuing body for the current version.
American Kennel Club — Sealyham Terrier
Breed overview, breed-trait chart, history, official standard summary and health notes from the AKC and the national parent club.
Read the sourceAccessed 2026-09-09
Canadian Kennel Club — Sealyham Terrier (Terriers)
Origin, temperament, activity level, height/weight, coat and grooming as described by the Canadian Kennel Club.
Read the sourceAccessed 2026-09-09
The Royal Kennel Club — Sealyham Terrier
Breed characteristics (size small, exercise up to 1 hour per day, lifespan over 10 years).
Read the sourceAccessed 2026-09-09
FCI nomenclature — Sealyham Terrier (standard no. 74, group 3)
FCI breed nomenclature entry with the official breed standard PDF in English, French, German and Spanish.
Read the sourceAccessed 2026-09-09
What owners say
Owner advice is quoted from public community posts and reflects those owners' opinions, not PocketPaw's position. It is unverified and not a substitute for professional advice. Each item links to where it was said.
“The parent club's health page describes the breed as generally healthy but prone to primary lens luxation, retinal dysplasia and sometimes deafness — hence regular eye and hearing examinations and DNA testing — and flags obesity and dental disease as everyday concerns, so a proper diet, daily walks, consistent coat stripping or clipping and dental care matter for a 12–14-year lifespan. Its voluntary health survey also tracks seizures, urinary stones and liver shunt.”
— American Sealyham Terrier Club — Sealyham Health via breed clubWorldwide2026-09-09
Sources
- [1]Sealyham Terrier — Dog Breed Information — American Kennel Club (Accessed 2026-09-09)
- [2]Sealyham Terrier — Choosing a Breed — Canadian Kennel Club (Accessed 2026-09-09)
- [3]Sealyham Terrier — Breeds A to Z — The Royal Kennel Club (Accessed 2026-09-09)
- [4]Sealyham Terrier — FCI standard no. 74 — Fédération Cynologique Internationale (Accessed 2026-09-09)
- [5]How do I help my dog adjust to spending time alone? — The Royal Kennel Club (Accessed 2026-09-09)
- [6]Incidence and risk factors for heat-related illness (heatstroke) in UK dogs under primary veterinary care in 2016 (Hall, Carter & O'Neill, Scientific Reports 10:9128) — Nature / Scientific Reports (Accessed 2026-09-09)
- [7]Sealyham Terrier Health — American Sealyham Terrier Club — American Sealyham Terrier Club (public health pages) (Accessed 2026-09-09)
Still have questions?
Ask owners on the PawMunity forum — every breed has its own board.
Breed data compiled by PocketPaw from the sources credited on each entry. Text and layout © 2026 NextPath Solutions Limited. Please link to a page rather than copying it.