Dog Heartworm Prevention and Welfare

Heartworm disease causes significant suffering in dogs and is largely preventable through consistent preventive care.

Key Facts

Heartworm disease is caused by parasitic worms transmitted by mosquitoes that grow in the heart and lungs
Untreated heartworm disease causes progressive heart failure, lung disease, and significant suffering before death
Prevention is dramatically safer, less expensive, and more welfare-positive than treatment of established infection
Treatment for established heartworm infection requires cage rest, multiple injections, and carries risks
Heartworm is endemic throughout the Americas, Australia, and parts of Europe and Asia

Welfare Considerations

Heartworm disease causes chronic suffering as larvae mature into adults occupying the heart and pulmonary arteries, causing progressive organ damage. Dogs with heavy worm burdens experience exercise intolerance, coughing, and respiratory distress. The tragedy is that this suffering is almost entirely preventable with monthly preventive medication. Access to affordable preventive care is a significant equity issue in animal welfare.

What You Can Do

Administer monthly heartworm preventive medication year-round as recommended by your veterinarian
Test annually for heartworm infection even with consistent prevention
Support programs providing subsidized heartworm prevention and treatment for low-income pet owners
Advocate for accessible veterinary care as a component of animal welfare
Donate to organizations providing free heartworm prevention in high-prevalence regions