Treating established heartworm infection is a lengthy, uncomfortable, and risky process. Understanding the welfare implications of treatment guides appropriate management decisions.
Heartworm treatment involves genuine welfare trade-offs: the treatment itself is painful and restrictive (weeks of cage rest), while untreated infection progresses to heart failure and death. For dogs with mild to moderate infection in good condition, the treatment burden is justified by the welfare benefit of eliminating the parasites. For dogs with severe infection, the risk of treatment complications must be weighed against the certainty of disease progression without treatment. The welfare case for prevention is overwhelming: monthly prophylactic medication eliminates the need for this difficult treatment entirely. For dogs already infected, the most welfare-positive approach is prompt diagnosis and treatment using current American Heartworm Society protocols.