Sealyham Terrier
Male: approximately 9 kg; Female: approximately 8.2 kg
Should not exceed 31 cm at the shoulder
12-14 years
Wales, United Kingdom
About the Sealyham Terrier
The Sealyham Terrier is a sturdy, short-legged powerhouse originally developed in the mid-19th century by Captain John Edwardes at Sealy Ham, Pembrokeshire. Despite their small stature, they possess the strength and spirit of a much larger dog, having been bred to face formidable prey like badgers and otters. They are distinguished by their rectangular silhouette, strong jaws, and a distinctive 'fall' of hair over their eyes, giving them a keen yet humorous expression. In the modern home, the 'Sealy' is known as the comedian of the terrier world. They are more relaxed and less 'scrappy' than some of their terrier cousins but remain intensely loyal and watchful. While they enjoy a good nap, they are always ready for an adventure or a game. Their unique combination of a rugged working history and an affectionate, even-tempered nature makes them exceptional companions for those who appreciate a dog with a distinct personality and a touch of Welsh heritage.
Breed Standard
Key characteristics from the breed standard
The Sealyham Terrier in the show ring is a study in substance and symmetry, possessing a long, powerful head and a level topline that remains firm on the move. Their gait is particularly distinctive—free, active, and parallel, covering ground with surprising efficiency for their leg length. They are the 'aristocrats' of the terrier group, carrying themselves with a calm, self-assured presence and a piercing, intelligent gaze from beneath a perfectly groomed fall. What truly sets the Sealyham apart is their remarkable blend of rugged utility and refined elegance; they possess a 'big dog' structure in a compact frame, matched with a coat of snowy brilliance that demands attention.
Bred For
Hunting badgers, otters, and foxes by going to ground
Temperament
Alert, courageous, comical, affectionate, and determined
Health Conditions Reported in the Breed
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Exercise Needs
Moderate daily activity; approximately 45–60 minutes of walking combined with play and mental stimulation.
Grooming Needs
High; requires regular brushing, professional clipping, or hand-stripping to prevent matting and maintain coat texture.
Living Suitability
Well-suited to apartment living or small yards, provided they receive daily walks; they are adaptable but value their indoor comforts.
Good with Kids
Generally good with older children who respect their boundaries; may be less tolerant of rough play from toddlers.
Good with Other Pets
Can be reserved or territorial with strange dogs; usually lives well with other household pets if socialized early, though high prey drive remains a factor.
Trainability
Highly intelligent but possesses a typical terrier independence; responds best to positive, variety-filled training sessions rather than repetitive drills.
Coat & Colours
Double coat with a wiry, weather-resistant topcoat and a dense, soft undercoat. All white, or white with lemon, brown, blue, or badger markings on the head and ears
Exercise needs vary by age, fitness, health, weather and individual temperament. Consult your veterinarian for an exercise plan appropriate for your dog.
Things to Consider
Every breed has its quirks — here's what to know
While the Sealyham is a delightful companion, they are predisposed to certain health and lifestyle quirks. As a chondrodystrophic breed (short-legged, long-backed), they are more likely to experience IVDD, meaning owners should discourage jumping from heights and maintain a lean weight to protect the spine. They are also prone to Primary Lens Luxation (PLL), an eye condition that can lead to glaucoma if not monitored. Like many terriers, they can be susceptible to atopic dermatitis or skin allergies; standard commercial diets high in fillers may exacerbate this, whereas many Sealies thrive on a clean, fresh-food diet. Owners should be prepared for their digging instincts—a remnant of their 'go-to-ground' history—and a moderate prey drive that makes a secure yard essential. They are also known for their independent streak; they will listen, but they often like to know 'what's in it for them' first. With patient training and consistent grooming, these traits are easily managed and simply part of their unique charm.
Feeding Guide for Your Sealyham Terrier
Healthy Weight
8.2-10 kg
Daily Feeding Amount (general starting estimate)
180-300 grams
For an adult Sealyham Terrier, a fresh or raw diet should be calculated at approximately 2-3% of their ideal body weight daily. For a standard 9kg dog, this equates to 180g to 270g per day, split into two meals. High-quality animal proteins should be the primary focus to maintain lean muscle mass and support skin health.
Feeding quantities are general starting estimates only. Individual needs vary with body condition, weight trends, age, health and activity. Ingredient percentages alone do not guarantee complete and balanced nutrition — consult a veterinarian for individualised dietary guidance.
Ingredient percentages alone do not guarantee complete and balanced nutrition. Seek veterinary or qualified canine nutrition guidance for individualised dietary advice. Raw feeding, specific proteins or fresh foods should not be presented as preventing, treating or managing breed health conditions without veterinary diagnosis and supervision.
Majestik's Recommended Feeding Approach
Breed Diet Notes
High-quality protein-rich diet focusing on skin support and joint health; highly suited to fresh or raw feeding to minimize additive-induced skin irritations.
A balanced raw diet for a Sealyham should include lean proteins available from Majestik such as Kangaroo or Beef to manage weight, combined with Omega-3 rich Fish to support their prone skin. Incorporating anti-inflammatory vegetables like leafy greens can further support joint health and mitigate IVDD risks.
These are general breed-level notes only. The appropriate food and serving amount depend on the individual dog's age, health, body condition, activity and tolerance.
Majestik Recommendation
Majestik BARF meals follow our practical 70/10/10/10 approach: approximately 70% quality meat and protein ingredients, 10% edible bone, 10% vegetables and 10% offal. This gives customers a convenient fresh-food option without needing to source and portion every ingredient themselves.
Our Beef, Lamb and Roo BARF meals provide convenient fresh-food options, with suitable proteins chosen or rotated according to the individual dog.
Suitable for different needs
- Healthy adult: Majestik adult Beef, Lamb or Roo BARF meal.
- Puppy: Majestik Premium Puppy.
- Senior: Majestik Senior Blend.
- Working or highly active dog: Suitable Majestik adult meal with quantity adjusted to workload and body condition.
- Protein trial: One Majestik protein at a time.
Recommended Majestik BARF Meals
This is a practical starting recommendation for healthy dogs. Individual needs vary with age, health, body condition and activity.
Sealyham Terrier Feeding Calculator
Personalised raw and cooked feeding recommendations based on your dog's profile
Ideal — Ribs palpable without excess fat. Visible waist. Abdominal tuck present.
Have a question about your Sealyham Terrier? Dog Health AI
Why Majestik?
Fresh, raw pet food made with integrity in South Australia
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Made in Two Wells, South Australia
Freshly Prepared
Real meat, organs, bone & wholefood ingredients
No Fillers
No cheap fillers or artificial preservatives
Family Owned
Locally owned and operated
Local Delivery
Delivery across Adelaide & selected areas
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Secure payment via Shopify checkout
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Breed Records & Facts
Average Litter Size
4-6 puppies
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References & Sources
Breed information verified against recognised breed authorities and veterinary evidence.