Understanding feline heartworm disease, its welfare impact on affected cats, and why prevention is far more effective than treatment.
Feline heartworm disease is a particularly cruel welfare problem because there is no safe adulticide treatment available for cats — unlike dogs, cats must live with the infection and manage its consequences. The disease causes chronic respiratory distress, intermittent vomiting, lethargy, and in some cases sudden death. Affected cats may suffer for months or years with a condition that cannot be cured, only managed with supportive care. The inflammatory storms triggered by dying worms cause acute suffering. Given that prevention is simple, safe, and effective, failure to use preventive medication in endemic areas represents a significant, avoidable welfare failure. Veterinary education and owner communication about feline heartworm risk is critical.