Internal parasites cause chronic welfare harm in companion animals through nutrient deprivation, tissue damage, and immune challenge. Regular prevention and monitoring are essential welfare responsibilities.
Internal parasite welfare management is a responsibility that requires regular prevention rather than reactive treatment after welfare costs have accumulated. Heartworm prevention is especially important because treatment after infection is expensive, difficult, and carries significant welfare risks. Routine fecal parasite screening, appropriate preventive treatments, and prompt response to detected parasites maintain welfare throughout a companion animals life.