Dog Mitral Valve Disease Management

Degenerative mitral valve disease is the most common heart disease in dogs, requiring staged management to maximize quality and length of life as the condition progresses.

Key Facts

DMVD accounts for approximately 75% of all canine heart disease
Cavalier King Charles Spaniels are disproportionately affected with near-universal disease by age 10
The condition progresses through stages A-D based on clinical signs and cardiac size
Pimobendan extends the preclinical stage and delays onset of heart failure significantly
ACE inhibitors and diuretics are added as disease advances to heart failure
Regular echocardiography guides treatment decisions and monitors disease progression
Dogs in heart failure can maintain good quality of life with appropriate medication
Breeding programs in Cavaliers include cardiac screening to reduce early-onset disease

Welfare Considerations

DMVD causes progressive welfare compromise as leaking mitral valves reduce cardiac efficiency, eventually causing heart failure with exercise intolerance, coughing, and respiratory distress. Early-stage disease causes no clinical signs, making it detectable only through cardiac examination. The transition to heart failure represents a significant welfare deterioration with breathlessness and exercise intolerance affecting all aspects of daily life. Pimobendan treatment in the preclinical stage demonstrably delays this progression, extending comfortable life. The EPIC trial showed preclinical treatment extended time to heart failure by 15 months. End-stage heart failure with refractory fluid accumulation requires compassionate end-of-life decision-making when quality of life becomes unacceptable.

What You Can Do

Have Cavalier King Charles Spaniels and other susceptible breeds screened annually for heart murmurs
Follow treatment escalation protocols with regular cardiac rechecks
Start pimobendan when criteria are met to delay heart failure onset
Monitor respiratory rate at home as an early warning sign of fluid accumulation
Learn to recognize signs of decompensated heart failure requiring emergency care
Support Cavalier cardiac breeding health programs to reduce disease prevalence