Heartworms can significantly shorten a dog’s lifespan if left untreated, often resulting in severe health issues or death. Typically, once a dog is infected by heartworms, these parasites can live for 5 to 7 years in their host. During this period, adult heartworms reside in the lungs, heart, and associated blood vessels, causing progressive damage to these vital organs. Early detection and treatment are crucial to managing the health risks associated with heartworm disease effectively. Regular veterinary check-ups and preventative measures are recommended to safeguard dogs against this life-threatening condition.