Cavalier King Charles Spaniel Health: MVD Heart Disease, Syringomyelia & Genetic Risks
Published: 2026-05-31 · Updated: 2026-06-12
The Cavalier King Charles Spaniel faces arguably the most significant breed-health crisis in the dog world: 90% of Cavaliers develop mitral valve disease (MVD) by age 10, and 50% show evidence of the disease by age 5. The breed's small skull conformation also predisposes 95%+...
Breed Health Profile
| Profile Type | Breed Health Profile |
|---|---|
| Common Triggers / Risk Factors | Mitral valve degeneration, Skull conformation (Chiari-like malformation), Genetic predisposition |
| Owner Mindset | Proactive health management, Informed ownership |
The Cavalier King Charles Spaniel faces arguably the most significant breed-health crisis in the dog world: 90% of Cavaliers develop mitral valve disease (MVD) by age 10, and 50% show evidence of the disease by age 5. The breed's small skull conformation also predisposes 95%+ to Chiari-like malformation, with up to 70% developing secondary syringomyelia (fluid-filled cavities in the spinal cord). These are not rare edge cases—they are the statistical norm for the breed. The UK's Royal Veterinary College has identified Cavaliers as having the highest heart disease burden of any breed studied.
Genetic Health Table
| Condition | Susceptibility Genes | Incidence Rate | Early Screening |
|---|---|---|---|
| Myxomatous Mitral Valve Disease (MVD) | Polygenic (multiple QTLs identified on CFA13, CFA14; heritability ~0.6) | 50% by age 5; 90% by age 10 | Annual cardiac auscultation starting at age 1; echocardiogram at age 2, then annually; ProBNP blood test |
| Syringomyelia (SM) / Chiari-like Malformation (CM) | Polygenic (skull/cranial conformation genes; small caudal fossa volume) | 95%+ have CM on MRI; 50-70% develop SM | MRI screening at 12-24 months (OFA CM/SM scheme); clinical scoring for pain (scratching, vocalization) |
| Episodic Falling Syndrome (EFS) | BCAN (single nucleotide deletion, autosomal recessive) | 5-10% carrier rate | DNA test (Animal Health Trust/UC Davis); clinical episodes triggered by exercise or excitement |
| Patellar Luxation | Polygenic (small breed association) | 5-8% | Orthopedic physical exam annually |
| Dry Eye (KCS) / Curly Coat Syndrome | FAM83H (autosomal recessive — associated with both dry eye and rough/curly coat) | 3-5% carrier rate | DNA test; Schirmer tear test at first sign of ocular discharge |
Breeding imperative: The MVD breeding guidelines from the Cavalier King Charles Spaniel Club recommend that breeding dogs should be at least 2.5 years old with a clear cardiac examination, and both parents should be heart-clear at age 5+. The UK's BVA/KC CM/SM Scheme grades syringomyelia on a 0-2 scale—breeding from grade 2 dogs is strongly discouraged. MRI screening of breeding stock is the only way to reduce SM prevalence.
Related Topics
References & Further Reading
- ASPCA. Common Dog & Cat Behavior Issues. aspca.org/pet-care
- American Animal Hospital Association (AAHA). Pet Behavior Resources. aaha.org
- Journal of Veterinary Behavior (Elsevier). Clinical Applications and Research. sciencedirect.com
- American Veterinary Society of Animal Behavior (AVSAB). Position Statements & Resources. avsab.org
Citations are provided for educational reference. Content is reviewed periodically but does not replace professional veterinary advice. If your pet shows signs of illness, contact a licensed veterinarian immediately.