Heartworm disease is a preventable parasitic infection that causes severe suffering in dogs. Understanding prevention and treatment protects dogs from this serious welfare threat.
Heartworm disease causes prolonged, progressive suffering as worms grow and multiply within the heart and pulmonary vessels over months to years. By the time clinical signs appear, significant organ damage has already occurred. The treatment process — immobilizing adult worms with arsenic compounds — requires strict exercise restriction for 8 weeks to prevent pulmonary embolism from dead worms entering the bloodstream. The suffering of both infection and treatment is entirely preventable through consistent monthly preventive medication. The welfare case for heartworm prevention is unambiguous: a small monthly intervention prevents months of suffering and a painful treatment process.