Canine heartworm disease causes severe cardiopulmonary damage and is potentially fatal without treatment. Effective monthly preventives make this entirely preventable, yet millions of dogs worldwide suffer needlessly from this disease.
Dogs with heartworm disease experience progressive exercise intolerance, coughing, respiratory distress, and heart failure as worm burden increases. The treatment itself causes significant welfare challenges — dying worms cause pulmonary inflammation requiring strict confinement for weeks. Preventable suffering on this scale represents a significant welfare failure. Regular veterinary care including annual heartworm testing and monthly preventive administration eliminates this disease burden entirely. In endemic areas, prevention should be considered a fundamental welfare responsibility for dog owners.