Mitral Valve Disease (MVD) in Cavalier King Charles Spaniels

Cardiac condition — Cavalier King Charles Spaniel — Small breed

Very High Risk
Cavalier King Charles Spaniel dog
Prevalence Very High
Age of Onset 3–8 years
Typical Cost $800–$2500
Category Cardiac

What is Mitral Valve Disease (MVD)?

Mitral valve disease is the most common heart condition in dogs overall and the dominant cardiac condition in small breeds. The mitral valve between the left heart chambers degenerates over time, causing a heart murmur and eventually congestive heart failure. Some breeds develop MVD at unusually young ages due to heritable factors.

In Cavalier King Charles Spaniels specifically: MVD is the defining health issue of the Cavalier. Nearly all Cavaliers develop MVD by age 10. The breed develops it earlier and more severely than any other breed — a direct consequence of historical breeding practices. The MVD Breeding Protocol aims to reduce prevalence.
Pet insurance for Mitral Valve Disease (MVD) in Cavalier King Charles Spaniels

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Symptoms of Mitral Valve Disease (MVD)

  • Heart murmur detected by veterinarian (often before outward symptoms)
  • Coughing, particularly at night or after lying down
  • Labored or rapid breathing
  • Reduced exercise tolerance
  • Fainting or weakness
  • Fluid accumulation in the chest or abdomen
When to see a vet: If you observe symptoms of Mitral Valve Disease (MVD), seek veterinary attention promptly — same-day if possible. This condition can progress rapidly.

How Is Mitral Valve Disease (MVD) Diagnosed?

A heart murmur detected during routine examination is usually the first sign. Definitive diagnosis uses echocardiogram to assess valve anatomy and heart function. Chest X-rays evaluate heart size and lung fluid. Grading the murmur (I–VI) gives a rough progression guide.

Treatment & Cost

In early stages, monitoring without medication. Once heart enlargement begins, medications such as pimobendan, ACE inhibitors, and diuretics are introduced. The EPIC and PROTECT trials established evidence-based treatment protocols now used widely. With modern treatment, dogs can live comfortably for years after diagnosis.

Typical treatment cost $800–$2,500 (annual medication and monitoring; pimobendan alone can cost $80–$200/month)
Cover the cost with pet insurance

Most pet insurance plans cover mitral valve disease (mvd) treatment in full when the policy is active before diagnosis. Compare plans below.

Trupanion — 90% reimbursement Pawp — $24/mo telehealth

Other Health Conditions in Cavalier King Charles Spaniels

Epilepsy High Hip Dysplasia Moderate Progressive Retinal Atrophy (PRA) Moderate Cataracts Moderate

View all Cavalier King Charles Spaniel health conditions →

Other Breeds Prone to Mitral Valve Disease (MVD)

Whippet Moderate