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Yorkshire Terrier

Yorkshire Terrier
Photo: Svenska Mässan from Sweden / CC BY-SA 4.0 · Wikimedia

228 Yorkshire Terriers in the atlas. Every number on this page has a source.

Population-genetic snapshot of Yorkshire Terriers in the Sniff Atlas, source-graded Mendelian carrier frequencies from Donner 2023, and nutrition guidance tied to the genetic findings above.

Also known as Yorkie.

See in the atlas → From CanVAS
The plain version

Yorkshire Terriers have a moderately varied genetic background. They are small dogs, usually weighing about 6 pounds, and often live around 13 years. Some health risks related to their gene pool include heart and spine conditions, so it’s a good idea to talk with your vet or consider genetic testing to keep your Yorkie happy and well.

What the atlas says about Yorkshire Terrier

In the atlas, the Yorkshire Terrier clusters consistently as Yorkshire Terrier (100% of the 228 dogs here). At the trait loci, SMAD2 runs lower than average (2% here vs 74%); FGF4_retrogene_CFA18 runs lower than average (14% here vs 77%).

High breed predictability score (1.03), individual dogs of this breed reliably cluster together genetically.

Genetic dimensions · CanVAS atlas

What the genome says about Yorkshire Terrier

Computed from the 18,477 research dogs in the Atlas.

Dogs in the Atlas
228Founders
129 from Hayward2016, 82 from Shannon, 10 from Spatola
Genetic diversity
0.32Moderate
Mean heterozygosity across the breed. Ranks 63rd most genetically tight of 107 ranked breeds.
What does genetic diversity mean?

How varied a breed's gene pool is — the share of gene spots where a typical dog of the breed carries two different versions rather than two identical ones.

How to read it: Higher = more diverse. Among well-sampled breeds it ranges roughly 0.22 (least diverse) to 0.33 (most diverse).

Diversity is a strength, not a verdict on any individual dog. Lower diversity means it's worth paying attention to recessive-risk testing — not that a dog is doomed.

Cluster structure
Splits into two genetic sub-populations
Intra-breed RMS distance: 23.91 · likely working/show-line, regional, or kennel lineage split.
What does within-breed variation mean?

How much individual dogs within the breed differ from each other genetically.

How to read it: Higher = more internal variety among individuals of the breed.

Sensitive to how many dogs of the breed we've sampled.

Related breeds
Built from
Gave rise to
Close cousins
Distant kin · one shared founding ancestor
In the Toy group
Explore the full lineage map →
VBO foundation stock (breeding records) · AKC breed group
Relatedness is documented lineage + kennel family. Genetic-ancestry distance measures diversity, not kinship, so it isn't used here.
How long they live
13.3years (life expectancy)
95% CI 13.3–13.4 · VetCompass, McMillan 2024, n=14,579. source
What does typical lifespan mean?

The median age dogs of the breed tend to reach.

How to read it: Higher = longer-lived. Compare to longevity-for-size to see whether it's just a size effect.

Drawn from population lifespan records; individual dogs vary widely with care, genetics, and luck.

Trait genetics
Allele frequencies at named morphology loci

Frequency of the alternate allele in this breed at each locus's representative SNP.

Body size
IGF1100%
HMGA20%
SMAD22%
LCORL97%
STC298%
ADAMTS1791%
Leg length
FGF4·CFA1814%
FGF4·CFA1286%
Coat
RSPO2100%
FGF556%
KRT7187%
MC1R88%
Ear set
MSRB346%
Skull shape
BMP355%
SMOC265%
n = 228 dogs · high confidence · CanVAS (Brundage 2026) · Sniff Atlas
Names & origins

Other names

The Yorkshire Terrier is also recorded as Yorkie.

Identified as Yorkshire Terrier (VBO:0201448) in the Vertebrate Breed Ontology (Mullen et al. 2025, CC-BY 4.0) · registry IDs FCI 86 · iDog 262 · VeNom 15087.

Temperament

What Yorkshire Terriers tend toward

Tendencies from owner surveys of purebred Yorkshire Terriers — a leaning across the breed, not a prediction for any one dog. A bar’s strength shows how much of that behavior breed actually explains: for most it’s faint, because the rest is your dog, their training, and the life you give them.

Dog Sociabilitybreed ~8%
less sociablehighly sociable
Biddabilitybreed ~18%
biddableindependent
Toy-directed Motor Patternsbreed ~18%
toy-directednot toy-directed
Environmental Engagementbreed ~9%
high engagementlow engagement
Agonistic Thresholdbreed ~9%
assertivediffident
Arousal Levelbreed ~8%
arousedcomposed
Human Sociabilitybreed ~11%
less sociablehighly sociable
Proximity Seekingbreed ~13%
affectionatealoof
n = 35 dogs · Morrill et al. 2022, Science, Darwin's Ark (CC0)
Owner-reported purebreds; each factor n ≥ 25. "Breed ~%" is the share of this behavior explained by breed.
What you see when you look at a Yorkshire Terrier

What does the genome say about how a Yorkshire Terrier looks?

Yorkshire Terriers look the way they do because of a small set of fixed and near-fixed morphology genes that, taken together, define the visible breed. Each translation below pairs the gene with the trait an owner actually sees, the breed's allele frequency at that locus, and a one-clause causal phrase.

Where the breed-defining genes act, mapped on a generic dog-body key — and how fixed each marker is in the Yorkshire Terrier. The figure is the most-settled marker we read in that region; the full per-locus panel is below. (The silhouette is a shared anatomical guide, not this breed's outline.)

Body sizeIGF1 · 100%Skull shapeSMOC2 · 65%EarsMSRB3 · 46%Leg lengthFGF4 CFA12 · 86%Coat & colorRSPO2 · 100%
CanVAS trait-locus panel (Brundage 2026)
15 morphology markers read across 5 regions. Allele frequency = how fixed a marker is in this breed, not whether your dog carries it.

Size and build

IGF1 is near-fixed at 100% for the small-body allele, which keeps the breed compact relative to its working-line ancestors.

IGF1what this gene does

IGF1 is a gene that plays a key role in determining a dog's body size. It influences how much a dog grows, affecting overall stature.

For your dog: Knowing about IGF1 gives you insight into your dog's size traits, but it’s just one part of the bigger picture when it comes to their health and care.

Full IGF1 gene page →

HMGA2 is at 0%, leaving most of the size signal to other loci in the panel.

HMGA2what this gene does

HMGA2 is a gene that influences body size in dogs, helping determine how big or small a dog grows.

For your dog: Knowing about HMGA2 helps you appreciate the genetic factors behind your dog's size, but it doesn't signal any health issues.

Full HMGA2 gene page →

SMAD2 is at 2%, leaving the height signal mostly to other size genes.

SMAD2what this gene does

SMAD2 is a gene involved in regulating body size by influencing how cells grow and develop.

For your dog: Knowing about SMAD2 helps understand your dog's size traits but isn't linked to health issues; no immediate action needed.

Full SMAD2 gene page →

LCORL is near-fixed at 97%, the NCAPG/LCORL height locus that is one of the strongest single contributors to canine body size.

LCORLwhat this gene does

LCORL is a gene that influences body size in dogs. It helps determine how big or small a dog might grow.

For your dog: Knowing about LCORL helps you appreciate the genetic factors behind your dog's size, but it’s just one piece of the bigger picture when it comes to health and care.

Full LCORL gene page →

STC2 is near-fixed at 98%, modulating growth-axis signaling toward the breed's body-size set point.

ADAMTS17 is at 91%, near-fixed for the size variant.

ADAMTS17what this gene does

ADAMTS17 is a gene that influences body size and also plays a role in certain eye conditions. It affects the structure of tissues in the eye and elsewhere in the body.

For your dog: If your dog belongs to a breed known to carry ADAMTS17 variants, it’s worth discussing genetic testing and eye exams with your vet to stay ahead of potential issues.

Full ADAMTS17 gene page →

Leg length

The FGF4 retrogene on chromosome 18 is at 14%, the chromosome-18 leg-length variant, which keeps the breed short-legged like Corgis and Dachshunds.

The FGF4 retrogene on chromosome 12 is near-fixed at 86%, the chondrodystrophic variant associated with intervertebral disc disease risk in breeds that carry it.

Coat type, length, and color

RSPO2 is near-fixed at 100% for the furnishings allele, the genetic basis of the eyebrows-and-mustache pattern seen in Schnauzers and Wheaten Terriers.

RSPO2what this gene does

RSPO2 influences the texture and appearance of a dog's coat, particularly the presence of 'furnishings' like mustaches and eyebrows. It helps determine whether a dog has that distinctive wiry or textured look.

For your dog: If your dog has those wiry eyebrows or a mustache, RSPO2 is part of the reason—no health worries, just a coat feature worth knowing about.

Full RSPO2 gene page →

FGF5 sits at 56% for the long-coat variant. Coat length is influenced by other loci as well, so intermediate FGF5 frequencies do not always correspond to intermediate visible coat lengths.

FGF5what this gene does

FGF5 is a gene that influences the length of a dog's coat. It acts like a natural switch, telling hair follicles when to stop growing longer fur.

For your dog: If your dog has a notably long or short coat, FGF5 is likely part of the reason—no action needed, but it’s a neat genetic detail to know.

Full FGF5 gene page →

KRT71 is near-fixed at 87% for the wavy/curly variant. Coat curl phenotype varies across breeds at this fixation depending on modifier loci, and visible expression is not always curled even when the locus is fixed.

KRT71what this gene does

KRT71 is a gene that influences the curliness of a dog's coat. It helps determine whether a dog's fur is straight or has a distinctive curl.

For your dog: If your dog has a curly coat, KRT71 is likely part of the reason; it’s a natural variation, not a health concern.

Full KRT71 gene page →

MC1R is at 88% at the representative SNP. MC1R controls the switch between red-to-gold and black-to-brown pigment, with the e/e homozygous genotype producing the gold-to-red spectrum by blocking eumelanin (black and brown pigment).

MC1Rwhat this gene does

MC1R is a gene that influences coat color in dogs, affecting how pigments are produced in the fur.

For your dog: Knowing about MC1R gives insight into your dog's coat color but doesn't relate to health issues.

Full MC1R gene page →

Ears

MSRB3 sits at 46% for the drop-ear allele, which is why ear set varies across the breed.

MSRB3what this gene does

MSRB3 is a gene involved in the development of ear shape and structure in dogs.

For your dog: Understanding MSRB3 helps explain why your dog's ears look the way they do, but it isn't linked to any health issues.

Full MSRB3 gene page →

Skull shape

BMP3 sits at 55%, contributing to the breed's moderate, mesaticephalic head shape rather than the extreme brachycephalic form.

BMP3what this gene does

BMP3 is a gene that influences the shape of a dog's skull, particularly contributing to a shorter, broader head shape known as brachycephaly.

For your dog: If your dog has a broad, short skull, it's worth discussing with your vet how this might impact their health, even though BMP3 isn't directly tied to illness.

Full BMP3 gene page →

SMOC2 sits at 65%, contributing to the breed's moderate head shape.

SMOC2what this gene does

SMOC2 influences the shape of a dog's skull, particularly affecting how flat or short the face appears.

For your dog: If your dog has a short nose, it's worth discussing with your vet how this trait might impact their health over time.

Full SMOC2 gene page →
Mendelian-disease genetics

What genetic diseases do Yorkshire Terriers carry?

From a panel of 250 Mendelian-disease variants screened in 1,054,293 dogs (Donner et al. 2023), Yorkshire Terriers carry 25 of them at observable frequency. Carrier frequency is not clinical risk. Most recessive variants require two copies for disease expression; many dominant variants show incomplete penetrance. Read this as a population fingerprint of what's in the gene pool, not a per-dog prediction.

Dilated Cardiomyopathy risk factor (Discovered in the Doberman Pinscher; PDK4-related)
Autosomal dominant (Incomplete penetrance)
high 13.4%
n = 8,367 dogs · 2 variants tested · OMIA:000162-9615 · omia.org →
PDK4what this gene does

PDK4 helps regulate how cells use energy, especially in the heart muscle.

For your dog: If your dog is one of the breeds known to carry this gene, it’s worth discussing heart health with your vet, but being a carrier doesn’t mean your dog will develop disease.

Chondrodystrophy and Intervertebral Disc Disease Risk (CDDY)
Autosomal dominant
high 6.4%
n = 8,324 dogs · 1 variant tested · OMIA:000157-9615 · omia.org →
FGF4what this gene does

FGF4 influences leg length by affecting bone growth, leading to shorter legs in certain breeds.

For your dog: If your dog is from a breed known to carry this gene, it's worth discussing spinal health with your vet, but being a carrier doesn’t guarantee problems.

Degenerative Myelopathy (DM)
Autosomal recessive (Incomplete penetrance)
moderate 13.0%
n = 8,367 dogs · 1 variant tested · OMIA:000263-9615 · omia.org →
SOD1what this gene does

SOD1 is a gene that helps protect cells from damage caused by harmful molecules called free radicals.

For your dog: If your dog is a carrier of SOD1 variants, it's worth discussing with your vet, but remember carrier status doesn't mean your dog will get the disease.

Progressive Rod-Cone Degeneration (prcd-PRA)
Autosomal recessive
low 6.8%
n = 8,343 dogs · 1 variant tested · OMIA:001298-9615 · omia.org →
PRCDwhat this gene does

PRCD is a gene involved in the health of a dog's retina, the part of the eye that detects light and helps with vision.

For your dog: If your dog belongs to a breed known to carry PRCD changes, it's worth discussing eye health and potential genetic testing with your vet.

Cone-Rod Dystrophy (cord1-PRA/crd4)
Autosomal recessive (Incomplete penetrance)
low 0.49%
n = 8,342 dogs · 1 variant tested · OMIA:001432-9615 · omia.org →
RPGRIP1what this gene does

RPGRIP1 is a gene involved in the function of photoreceptor cells in the eye, which help dogs see in different light conditions.

For your dog: If your dog belongs to a breed known to carry RPGRIP1 mutations, it’s worth discussing with your vet to understand the risks and monitor eye health.

Von Willebrand's Disease, Type 1 (vWD 1)
Autosomal recessive
low 0.38%
n = 8,367 dogs · 1 variant tested · OMIA:001057-9615 · omia.org →
Primary Lens Luxation (PLL)
Autosomal recessive
low 0.36%
n = 8,367 dogs · 2 variants tested · OMIA:000588-9615 · omia.org →
ADAMTS17what this gene does

ADAMTS17 is a gene that influences body size and also plays a role in certain eye conditions. It affects the structure of tissues in the eye and elsewhere in the body.

For your dog: If your dog belongs to a breed known to carry ADAMTS17 variants, it’s worth discussing genetic testing and eye exams with your vet to stay ahead of potential issues.

Full ADAMTS17 gene page →
Canine Multifocal Retinopathy 1 (Discovered in Mastiff-related breeds; CMR1)
Autosomal recessive
low 0.32%
n = 8,367 dogs · 1 variant tested · OMIA:001444-9615 · omia.org →
BEST1what this gene does

BEST1 is a gene that helps maintain the health of the retina, the light-sensitive layer at the back of the eye. It plays a role in keeping the cells in the retina functioning properly.

For your dog: If your dog is from a breed known to carry BEST1 variants, it’s worth discussing retinal health with your vet, especially if you notice any vision changes.

Craniomandibular Osteopathy (Discovered in the Cairn, Scottish and West Highland White Terrier)
Autosomal dominant (Incomplete penetrance)
low 0.20%
n = 8,367 dogs · 1 variant tested · OMIA:002244-9615 · omia.org →
SLC37A2what this gene does

SLC37A2 is a gene involved in how cells manage certain sugar molecules, which can affect bone development.

For your dog: If your dog is from a breed known to carry this gene variant, it's worth discussing with your vet, especially if you notice jaw discomfort or eating issues.

Cystinuria Type I-B (SLC7A9 p.A217T)
Autosomal recessive (Incomplete penetrance)
low <0.1%
n = 8,367 dogs · 2 variants tested · OMIA:001880-9615 · omia.org →
SLC7A9what this gene does

SLC7A9 is a gene that helps transport certain amino acids in the kidneys. It plays a role in how the body handles cystine, an amino acid that can form crystals.

For your dog: If your dog is a carrier, it’s worth discussing with your vet to monitor urinary health and catch any issues early.

Prekallikrein Deficiency
Autosomal recessive
low <0.1%
n = 8,367 dogs · 1 variant tested · OMIA:000819-9615 · omia.org →
KLKB1what this gene does

KLKB1 is a gene that helps produce prekallikrein, a protein involved in blood clotting and inflammation.

For your dog: If your dog is from a breed known to carry KLKB1 variants, it's worth asking your vet about blood clotting tests, especially before surgeries.

Collie Eye Anomaly (CEA)
Autosomal recessive
low <0.1%
n = 8,367 dogs · 1 variant tested · OMIA:000218-9615 · omia.org →
NHEJ1what this gene does

NHEJ1 is a gene involved in repairing breaks in DNA, helping maintain the integrity of genetic information in cells.

For your dog: If your dog belongs to one of the breeds known to carry this gene variant, it's worth discussing testing with your vet to understand any potential eye health risks.

Early-Onset Progressive Polyneuropathy (Discovered in the Greyhound)
Autosomal recessive
low <0.1%
n = 8,367 dogs · 2 variants tested · OMIA:002120-9615 · omia.org →
NDRG1what this gene does

NDRG1 is a gene involved in nerve cell function and maintenance, helping keep the nervous system working properly.

For your dog: If your dog is from a breed known to carry NDRG1 variants, it’s worth discussing with your vet, especially if you notice any mobility issues.

Progressive Retinal Atrophy (Discovered in the Giant Schnauzer; NECAP1-related)
Autosomal recessive
low <0.1%
n = 8,367 dogs · 1 variant tested · OMIA:002198-9615 · omia.org →
Bleeding disorder (Discovered in the Greater Swiss Mountain Dog; P2RY12-related)
Autosomal recessive
low <0.1%
n = 8,367 dogs · 1 variant tested · OMIA:001564-9615 · omia.org →
P2RY12what this gene does

P2RY12 is a gene that helps control how platelets stick together to form blood clots, which is essential for stopping bleeding.

For your dog: If your dog is from one of these breeds, it’s worth asking your vet about P2RY12 to understand any potential bleeding risks, especially before surgery or injury.

Macrothrombocytopenia (Discovered in the Norfolk and Cairn Terrier)
Autosomal recessive
low <0.1%
n = 8,367 dogs · 1 variant tested · OMIA:002434-9615 · omia.org →
TUBB1what this gene does

TUBB1 is a gene that helps make the building blocks of platelets, which are tiny blood cells important for clotting. It plays a key role in keeping platelet size and number normal.

For your dog: If your dog is from one of the breeds known to carry TUBB1 variants, it’s worth mentioning to your vet, especially before surgeries or if you notice unusual bleeding.

Congenital Hypothyroidism (Discovered in the Toy Fox and Rat Terrier)
Autosomal recessive
low <0.1%
n = 8,366 dogs · 2 variants tested · OMIA:000536-9615 · omia.org →
Dental Hypomineralisation (Discovered in the Border Collie)
Autosomal recessive
low <0.1%
n = 8,363 dogs · 1 variant tested · OMIA:002015-9615 · omia.org →
FAM20Cwhat this gene does

FAM20C is a gene that plays a key role in the mineralization of teeth, helping them develop properly and stay strong.

For your dog: If your dog is from one of these breeds, it's worth mentioning FAM20C to your vet when discussing dental care, but being a carrier doesn't mean your dog will have problems.

Cystinuria Type I-A (SLC3A1 p.I192V)
Autosomal recessive
low <0.1%
n = 8,367 dogs · 3 variants tested · OMIA:000256-9615 · omia.org →
SLC3A1what this gene does

SLC3A1 is a gene that helps transport certain amino acids in the kidneys. It plays a key role in preventing the buildup of cystine, which can form stones.

For your dog: If your dog is from a breed known to carry SLC3A1 variants, it’s worth discussing cystinuria risks with your vet, especially if urinary issues arise.

Exercise-Induced Collapse (EIC)
Autosomal recessive (Incomplete penetrance)
low <0.1%
n = 8,366 dogs · 1 variant tested · OMIA:001466-9615 · omia.org →
DNM1what this gene does

DNM1 is a gene that helps nerve cells communicate properly by managing how they send signals during muscle activity.

For your dog: If your dog belongs to one of the breeds known to carry this gene variant, it's worth discussing EIC with your vet, especially if your dog is very active or shows signs of weakness during exercise.

Plus 5 more at lower frequency. Full table available via the API when shipped.
Source: Donner J et al. 2023. Genetic prevalence and clinical relevance of canine Mendelian disease variants in over one million dogs. PLOS Genetics 19(2):e1010651 · Evidence: Limited (DTC ascertainment, tag-SNP proxy) · Confounding MEDIUM · License CC-BY-4.0 · Phene IDs from OMIA (Sydney School of Veterinary Science, The University of Sydney; DOI 10.25910/2AMR-PV70).
Sample size in this breed: 8,367 dogs from the Donner 2023 cohort.

Which Mendelian variants matter most for Yorkshire Terriers?

The Mendelian-disease table above lists variants screened in 8,367 Yorkshire Terriers (Donner 2023). Four carry frequencies high enough to matter clinically; two of those dominate the breed’s health conversation.

Dilated cardiomyopathy in Yorkshire Terriers is an autosomal-dominant, incomplete-penetrance cardiac condition linked to a TTN variant first discovered in Doberman Pinschers. The variant increases risk of progressive heart-muscle weakening. Not every Yorkshire Terrier carrying one copy will develop clinical disease. 13.4% of Yorkshire Terriers in the Donner cohort carry the variant (n=8,367; Donner 2023).

The incomplete penetrance means the variant is a risk factor, not a fate. The age at which clinical disease may emerge in Yorkshire Terrier carriers has not been characterized in published breed-specific studies. Testing is available through most commercial canine DNA laboratories. Yorkshire Terrier owners with cardiac-risk carriers should expect annual or biennial echocardiography or cardiac auscultation from a vet who listens carefully for murmurs.

Chondrodystrophy and Intervertebral Disc Disease Risk (CDDY)

The CDDY variant in Yorkshire Terriers carries incomplete penetrance and a complex phenotype. The FGF4 retrogene at CFA12 is present in 86% of Yorkshire Terriers and the CFA18 insertion in 14% (morphology loci, Donner 2023), but the breed standard shows normal limb proportions, the classical chondrodystrophic body shape of Dachshunds and Corgis is not the Yorkshire Terrier phenotype. What IS consistent in Yorkshire Terriers who carry CDDY is intervertebral disc disease risk, particularly in middle age. 6.4% of Yorkshire Terriers in the Donner cohort carry the CDDY variant (n=8,324).

Let that settle. The breed-club health committees in chondrodystrophic breeds treat IVDD prevention seriously because the morphology amplifies disc herniation risk. Yorkshire Terriers do not have that morphological amplification, yet they still carry the genetic variant. The result is IVDD risk without the leg-length phenotype. Testing exists and is recommended for breeding stock.

Degenerative Myelopathy (DM)

Degenerative myelopathy in Yorkshire Terriers is a late-onset, progressive spinal-cord degeneration caused by an autosomal-recessive variant with incomplete penetrance. Affected dogs develop rear-limb weakness, typically in advanced age. The disease is relentless once symptomatic; onset in affected dogs tends to be in later life, though breed-specific age data for Yorkshire Terriers are not yet published. 13.0% of Yorkshire Terriers carry one copy (n=8,367).

Carrier frequency is notable; phenotypic frequency is much lower because two copies are required and penetrance is incomplete. Testing is available and useful for breeding decisions to avoid carrier-to-carrier matings.

Progressive Rod-Cone Degeneration (prcd-PRA)

Progressive rod-cone degeneration in Yorkshire Terriers is an autosomal-recessive retinal atrophy. Affected dogs gradually lose vision, starting with night blindness and progressing to total blindness, typically in middle age. 6.8% of Yorkshire Terriers carry one copy (n=8,343).

Testing is straightforward and available from most canine genetic laboratories. The breed-club health perspective is to test breeding stock and avoid carrier-to-carrier pairings.

How should I test my Yorkshire Terrier?

A breed-specific panel covering the TTN-linked DCM risk variant (cardiac risk), CDDY (IVDD risk), SOD1-linked DM (degenerative myelopathy), and PRCD-linked prcd-PRA (progressive rod-cone degeneration) captures the four highest-frequency health variants. A CLIA-accredited laboratory like PennGen or Embark can deliver results within two to three weeks. If you are a breeding owner, test both sire and dam before any pairing.

What should I feed a Yorkshire Terrier?

Yorkshire Terriers weigh 4 to 7 pounds as adults, which means missed meals carry real metabolic risk. A single skipped feeding can drop a Yorkshire Terrier’s blood sugar into the hypoglycemic range within hours. Meal frequency and consistency matter more in this breed than in larger dogs, and the TTN-linked DCM risk variant at 13.4% carrier frequency (Donner 2023, n=8,367) adds a second dietary layer.

Meal frequency and timing are non-negotiable. Puppies need four meals daily until age six months, then three meals until age one year, then two meals daily for life. A Yorkshire Terrier eating once a day is a Yorkshire Terrier at metabolic risk. Caloric needs for a 4-pound adult Yorkshire Terrier are modest; consult your veterinarian or a board-certified veterinary nutritionist for an individualized target based on activity level and body condition score. Feed on a schedule, not ad libitum.

Grain-inclusive, taurine-fortified formulations are the breed standard. The TTN-linked DCM risk variant is an autosomal-dominant, incomplete-penetrance trait, not a diet-responsive condition in the way that grain-free-diet-associated DCM is. However, taurine sufficiency is important for all cardiac-risk carriers. Choose an adult formula from a manufacturer that publishes feeding trials and third-party nutrient assays. Verify the taurine content is above 0.1% on a dry-matter basis for adults.

Weight management from youth onward is critical. Yorkshire Terriers are food-motivated and their small frame means a single pound of extra weight represents roughly 14 to 25% of their body mass for a breed that weighs 4 to 7 pounds. Yorkshire Terriers rank 63 of 107 breeds in heterozygosity, suggesting moderate historical bottleneck and some metabolic constraints., but obesity accelerates IVDD presentation in CDDY carriers and complicates cardiac management. Measure portions. Use a kitchen scale, not guessing.

Avoid raw-meat diets without clear nutritional analysis. Small-breed puppies and adults have tighter margins for nutrient timing than large-breed dogs. If you feed raw or home-cooked meals, work with a board-certified veterinary nutritionist (American College of Veterinary Nutrition, ACVN) to ensure calcium, phosphorus, and taurine are adequate. Commercial raw diets vary widely in nutrient balance; most lack published feeding-trial data.

What we don’t know

Yorkshire Terriers are a genetically tight breed. The founder cohort is small (Hayward2016 accounts for 129 of the atlas dogs; Shannon 82), and the heterozygosity rank sits at 63 of 107 breeds, suggesting some degree of historical bottleneck. The consequence is moderate linkage disequilibrium, which means that rare variants and modifier loci for the common ones (PDK4, CDDY, DM, prcd) may be in-breed-common but poorly characterized. We do not yet know whether Yorkshire Terriers have breed-specific modifiers that influence penetrance or age-of-onset for any of these four.

The PDK4-cardiac-risk variant was discovered in Doberman Pinschers and later found across multiple breeds. The Yorkshire Terrier experience with this variant is not yet fully mapped. We know it is present at 13.4% carrier frequency, but the breed-specific incidence of clinical dilated cardiomyopathy in TTN-variant carriers remains incompletely characterized.

Frequently asked questions about Yorkshire Terriers

What is the most common genetic disease in Yorkshire Terriers? The TTN-linked DCM risk variant is the most frequent, at 13.4% carrier frequency (Donner 2023, n=8,367). Degenerative myelopathy carrier frequency is also high at 13.0%. Neither produces universal phenotypic expression because both have incomplete penetrance.

Are Yorkshire Terriers prone to heart disease? The TTN-linked DCM risk variant is present in 13.4% of Yorkshire Terriers, which elevates cardiac-disease risk in carriers (Donner 2023, n=8,367). Not all carriers develop clinical dilated cardiomyopathy. Annual cardiac auscultation is reasonable for breeding stock and older dogs.

How long do Yorkshire Terriers live? The atlas-derived median lifespan for Yorkshire Terriers is 12.9 years. Life expectancy is typical for toy breeds. Good nutrition, weight management, and regular veterinary care are the primary levers.

Should I do a DNA test on my Yorkshire Terrier? For breeding stock, yes. The panel should cover the TTN-linked DCM risk variant (cardiac risk), CDDY (IVDD risk), SOD1-linked DM (degenerative myelopathy), and PRCD-linked prcd-PRA (progressive rod-cone degeneration). If your dog is a pet, testing is optional unless clinical signs (vision loss, rear-limb weakness) prompt investigation.

What is the best diet for a Yorkshire Terrier? Two meals daily of a grain-inclusive, taurine-fortified adult formula from a manufacturer with published feeding trials. Portion control is critical because Yorkshire Terriers are small and food-motivated. Avoid meal-skipping; one missed feeding can risk hypoglycemia.

Are Yorkshire Terriers good with kids? Yorkshire Terriers are toy breeds weighing 4 to 7 pounds, which makes them fragile around small children. Supervision is essential. They bond well to their people and are alert and affectionate in stable households.

Do Yorkshire Terriers need special grooming? Yorkshire Terriers have a long, silky coat that requires daily brushing to prevent matting. Many owners keep them in a short puppy clip for easier maintenance. Grooming is a breed standard, not optional.

What is intervertebral disc disease and should I worry about it? Intervertebral disc disease (IVDD) is spinal-cord compression from disc herniation. Yorkshire Terriers carry the CDDY genetic risk at 6.4% but do not have the shortened-limb morphology that amplifies disc-disease risk in Dachshunds. The genetic risk is real; prevention includes weight management and avoiding repetitive jumping and stairs.

A gift to human medicine

Yorkshire Terriers are a natural model for human disease

Because the same genes cause the same conditions across species, the inherited conditions documented in Yorkshire Terriers help researchers understand, and work toward treating, the human diseases they model. This is the dog advancing human medicine. The breed models the human disease; it does not have it, and this is not a prediction for your dog.

Human equivalents via OMIA → Mondo / OMIM. Model-of, not identity.
Documented in OMIA

Every condition recorded in the Yorkshire Terrier

Beyond the testable carriers above, OMIA's literature catalogue records 19 genetic conditions in the Yorkshire Terrier, 15 of which have a known human equivalent. This is the documented landscape across all Yorkshire Terriers ever studied, not a prediction for any one dog.

Plus 1 more conditions recorded in the Yorkshire Terrier in OMIA.

Online Mendelian Inheritance in Animals (OMIA); Nicholas, Tammen & Sydney Informatics Hub, DOI 10.25910/2AMR-PV70
Documented in the breed's literature is not carrier status and not a forecast for an individual dog. Human equivalents are mapped via Mondo/OMIM. Carrier frequencies (above) are the separately-measured testable subset (Donner 2023).
The data behind this page

Where every number on this page came from.

This page draws on three primary data sources. Carrier frequencies for the Mendelian section come from Donner et al. 2023 (CC-BY-4.0). We grade these data at evidence Limited because the cohort is a direct-to-consumer ascertainment, which biases toward owners who chose to test their dogs. The panel also uses tag-SNP proxies for some variants rather than direct causal-variant assays. Limited is a study-design grade, not a quality grade: the Donner cohort is the largest open canine-genotype dataset in existence and we are grateful for it. We rate the confounding MEDIUM.

Population-genetic dimensions (heterozygosity, intra-breed PCA distance, nearest neighbors, trait-locus frequencies) come from CanVAS (Brundage 2026), harmonized through the Sniff Atlas. The exact release date and verification commit are pinned at the bottom of the page so a researcher can trace a number back to a specific snapshot. The disease-gene-variant graph comes from OMIA (Online Mendelian Inheritance in Animals; Nicholas, Tammen, and the Sydney Informatics Hub at the Sydney School of Veterinary Science, The University of Sydney; retrieved April 2026, DOI 10.25910/2AMR-PV70).

What this page does not yet have. Inheritance modes and per-disease penetrance evidence from Donner 2023 are now in the structured data for every variant the panel covers. Mondo, OMIM, Ensembl, and HGNC cross-references on gene pages remain pending, they arrive in December 2026 alongside the imputed 9.67M-variant CanVAS dataset via the OMIA SQL dump absorption. Until then, gene IDs carry NCBI Gene and OMIA phene URLs only; the wider human-homolog and disease-ontology cross-reference set fills in with that release.

How to cite this page. The computed dimensions on this page are derived from the open Sniff Atlas v1.0.1 (Gehring 2026, doi:10.5281/zenodo.20566358, CC-BY 4.0). Full citation formats including BibTeX, RIS, and CITATION.cff at sniff.world/cite.

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References
  1. Donner J, Freyer J, Davison S, Anderson H, Blades M, Honkanen L, et al. (2023). Genetic prevalence and clinical relevance of canine Mendelian disease variants in over one million dogs. PLOS Genetics 19(2):e1010651. doi:10.1371/journal.pgen.1010651
  2. Brundage J, et al. (2026). CanVAS: a harmonized canine variant atlas. bioRxiv. doi:10.64898/2026.04.13.718238
  3. Nicholas, F.W., Tammen, I., & Sydney Informatics Hub. (2026). Online Mendelian Inheritance in Animals (OMIA) [dataset]. The University of Sydney. https://omia.org. doi:10.25910/2AMR-PV70 (retrieved April 2026).
Last updated
Sources: CanVAS (Brundage 2026) · Donner 2023 · OMIA