Sealyham Terrier

Temperament: Alert, Outgoing, Sense Of Humor

  • Height: 10.5 inches
  • Weight: 23-24 pounds (male), slightly less (females)
  • Life Expectancy: 12-14 years
  • Group: Terrier Group 

The Sealyham Terrier is brave and spirited, but not as spiky as smaller terriers. These sturdy, outgoing companions are recognized by their “fall,” the mass of hair covering the forehead. Sealy fans enjoy their dog’s sly sense of humor.


Long, broad and powerful, without coarseness. It should, however, be in perfect balance with the body, joining neck smoothly. Length of head roughly three-quarters height at withers, or about an inch longer than neck. Breadth between ears a little less than one-half length of head. stop. Cheeks – Smoothly formed and flat, without heavy jowls. Jaws – Powerful and square. Nose – Black, with large nostrils. White, cherry or butterfly bad faults.

About the Sealyham Terrier

Standing less than 11 inches at the shoulder and weighing about 24 pounds, Sealys are not big enough to be considered medium-sized dogs, but they stand among the strongest and most substantial of what we think of as small dogs.

A typical Sealy is well-muscled, built low to ground, and moves easily with long, determined strides. The weatherproof coat is predominantly white, and a long, broad head is furnished with lavish facial hair. Despite their rep as the bruiser among short-legged terriers, Sealys are cute, funny, affectionate, outgoing, and trainable, if a bit stubborn. Their alertness and a big-dog bark make Sealys excellent watchdogs. Blessed with an adaptable nature, Sealys are amenable to city dwelling or country life.

NUTRITION The Sealyham Terrier should do well on a high-quality dog food, whether commercially manufactured or home-prepared with your veterinarian’s supervision and approval. Any diet should be appropriate to the dog’s age (puppy, adult, or senior). For a Sealy who competes in dog shows, avoid food containing extra dye, as the dye tends to stain beards and may also color the urine, which can leave hair yellowish. Some dogs are prone to getting overweight, so watch your dog’s calorie consumption and weight level. Treats can be an important aid in training, but giving too many can cause obesity. Learn about which human foods are safe for dogs, and which are not. Check with your vet if you have any concerns about your dog’s weight or diet. Clean, fresh water should be available at all times.

GROOMING The breed’s weather-resistant, double “jacket” and profuse leg and body furnishings must be combed and brushed every two or three days, as Sealy coats tend to mat easily. The coat does not shed but must be hand-stripped or clipped on a regular basis. Pet Sealyhams can be kept trimmed short with minimal furnishings, which makes their care easier. Bathing every three to four weeks is a good idea. For Sealyhams in show coat, washing at least the furnishings frequently is a must

EXERCISE Sealys love to run in a safely enclosed area and enjoy plenty of exercise. They can overheat in hot, humid weather, so exercise is best in the early morning and in the evening. Grass stains are common, and it may be necessary to wash furnishings and condition often. Encourage Sealys to exercise so they get moderately tired, but not exhausted, and they will be calmer in the house. Sealys can be very active, and exercise helps them be better house pets.

TRAINING As with most terriers, Sealys require a firm but not harsh training technique. The Sealy puppy should be socialized early, being gently exposed to a wide range of dogs, people, and places, and this will help to discourage any dog aggression later on. Sealys can be food guarders, and this must be corrected right away. Don’t allow the dog to get away with it, ever.

HEALTH Allergies are fairly common in the breed but are seldom of a really serious nature. There are several genetic eye diseases that potential sires and dams should be tested for before breeding. The American Sealyham Terrier Club provides detailed information on breed health. Non-genetic eye conditions such as tearing and infections can occur because of the breed’s long eyebrows. If the dog is a pet, a shorter eyebrow fall is a good idea. Ear infections can occur due to the weight and position of the ears, but keeping the ears clean is usually all that is required for prevention and maintenance.

Recommended Health Test from the National Breed Club:

  • Ophthalmologist Evaluation
  • PLL DNA Test

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