Heartworm disease causes severe cardiopulmonary suffering in dogs and is entirely preventable with monthly preventive medication. Expanding access to prevention is a significant companion animal welfare goal.
Heartworm disease represents a preventable welfare crisis affecting millions of companion dogs, particularly in warm climates and underserved communities where preventive care is less accessible. The suffering caused by established heartworm infection — exercise intolerance, chronic coughing, heart failure — is significant and progressive. The tragedy is that this suffering is entirely preventable with inexpensive monthly medication. Barriers to prevention include cost, veterinary access, and owner awareness. Community heartworm prevention programs that provide free or subsidized preventive medication in high-prevalence areas are among the most cost-effective interventions for companion animal welfare at population scale.