The Breed History
A small town in Wales called Sealyham was the first recorded home
of the breed. In the late 1800s, crosses to breeds such as Dandie
Dinmont, Corgi, Westie, and perhaps Wirehaired Fox Terriers were
done to develop this hardy athletic stock. AKC registration first
occurred in 1911, and it was about that time also that the breed
was first brought to North America.
Breeding for Function
Hunting, defense, tracking of mid-sized quarry such as otter, badger
and fox were some of the tasks these dogs were bred for. Digging
and endurance, combined with lightning speed contributed to the
success of the hunt.
Physical Characteristics
Height at Withers: ideal is 10.5" (26.5 cm)
Weight: females 22 lb (10 kg), males 23-24 lb (10.5-11 kg).
Coat: White to creamy white, the coarse haircoat is variably marked
with small areas of beige or so-called lemon or badger distributed
mostly around the head.
Longevity: 14-16 years.
Points of Conformation: Their slightly convex skulls, moderate
stop and strong jaws contribute to the tough terrier image. Dark,
deep and widely set oval eyes, black nose, and small triangular ears
folded down with fine leather characterize their faces. Tails may be
docked, and are carried vertical. A medium neck, large compact feet
with arched toes and short-coupled stocky muscular body with a
deep chest, level topline, and powerful build behind complete the
image. Their way of going is quick, agile, and straight.
Recognized Behavior Issues and Traits
Reported breed traits include: Alert intelligence, a calculating
stubborn streak, loyalty and adaptability to both country and city
living make them a great companion. Their fanciers sometimes
attribute to them a sense of humor. They thrive on close human
contact and lots of attention. They enjoy barking, and are of
medium trainability. They need moderate exercise and are
considered low activity dogs and low shedders. Regular clipping,
grooming or plucking will keep the coat in top form.
Normal Physiologic Variations
None reported
Drug Sensitivities
None reported
Inherited Diseases
Patella Luxation: Polygenically inherited laxity of patellar ligaments,
causing luxation, lameness, and later degenerative joint disease.
Treat surgically if causing clinical signs. Too few Sealyham Terriers
have been screened by OFA to determine an accurate frequency.
Primary Lens Luxation (PLL) and Secondary Glaucoma: An
autosomal recessive gene causes primary lens luxation. Homozygous
affected dogs usually develop lens luxation between 3-5 years of
age. Rarely, heterozygous carriers can develop lens luxation, but
at a later age. Lens luxation can lead to secondary glaucoma and
blindness. A genetic mutation has been identified, and a genetic
test is available. OFA testing shows 38% carrier, and 5% affected.
Identified in 1.79% of Sealyham Terriers CERF examined by
veterinary ophthalmologists between 2000-2005. CERF does not
recommend breeding any Sealyham Terrier with lens luxation.
Retinal Dysplasia: Autosomal recessive inheritance. Congenital
retinal folds, geographic, and generalized retinal dysplasia with
detachment is seen in Sealyham Terriers. Can progress to blindness.
Identified in 2.98% of Sealyham Terriers CERF examined by
veterinary ophthalmologists between 2000-2005. CERF does not
recommend breeding any Sealyham Terrier with retinal dysplasia.
There is no genetic test.
Hip Dysplasia: Polygenically inherited trait causing degenerative
joint disease and hip arthritis. Too few Sealyham Terriers have been
screened by OFA to determine an accurate frequency.
Elbow Dysplasia: Polygenically inherited trait causing elbow
arthritis. Too few Sealyham Terriers have been screened by OFA to
determine an accurate frequency.
Disease Predispositions
Persistent Pupillary Membranes: Strands of fetal remnant
connecting; iris to iris, cornea, lens, or involving sheets of tissue.
The later three forms can impair vision, and dogs affected with
these forms should not be bred. Identified in 5.95% of Sealyham
Terriers CERF examined by veterinary ophthalmologists between
2000-2005.
Cataracts: Anterior cortex punctate, and anterior or posterior
cortex intermediate cataracts predominate in the breed. Identified
in 3.57% of Sealyham Terriers CERF examined by veterinary
ophthalmologists between 2000-2005. CERF does not recommend
breeding any Sealyham Terrier with a cataract.
Distichiasis: Abnormally placed eyelashes that irritate the cornea
and conjunctiva. Can cause secondary corneal ulceration. Identified
in 3.57% of Sealyham Terriers CERF examined by veterinary
ophthalmologists between 2000-2005.
Allergic Dermatitis (Atopy): Inhalant or food allergy presents with
pruritis and pyotraumatic dermatitis (hot spots). Sealyham Terriers
are over-represented with atopy versus other breeds.
Hypothyroidism: Inherited autoimmune thyroiditis. 2.0% positive
for thyroid autoantibodies based on testing at Michigan State
University. (Ave. for all breeds is 7.5%).
Vitreous Degeneration: A liquefaction of the vitreous gel which
may predispose to retinal detachment resulting in blindness.
Identified in 1.90% of Sealyham Terriers CERF examined by
veterinary ophthalmologists between 2000-2005.
Deafness: Congenital sensorineural deafness is reported in the
breed. Can be unilateral of bilateral. Diagnosed by BAER testing.
Unknown mode of inheritance.
Chronic otitis externa, and disk disease are reported on the
American Sealyham Terrier Club website.
Brachygnathism, Keratoconjunctivitis Sicca, Prognathism and
Progressive Retinal Atrophy are reported.
Isolated Case Studies
None reported
Genetic Tests
Tests of Genotype: Direct genetic test for lens luxation is available
from OFA.
Tests of Phenotype: CHIC Certification: Required testing includes
CERF eye examination and direct test for lens luxation. (See CHIC
website: www.caninehealthinfo.org).
Recommend patella evaluation, hip and elbow radiographs, thyroid
profile including autoantibodies, and cardiac examination.
Miscellaneous
- Breed name synonyms: Sealyham
- Registries: AKC, CKC, UKC, KCGB (Kennel Club of Great Britain),
ANKC (Australian National Kennel Club), NKC (National Kennel Club)
- AKC rank (year 2008): 152 (56 dogs registered)
- Internet resources: American Sealyham Terrier Club:
http://clubs.akc.org/sealy
Sealyham Terrier Club of Canada:
www.sealyhamcanada.com
Sealyham Terrier Breeders Association (UK):
www.davmar.freeuk.com/sealyhambreedersassoc.html
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