Heartworm in Dogs: Causes, Symptoms, Treatment, and Prevention
Heartworm disease is a serious and potentially life-threatening condition that affects dogs across the United States. Caused by parasitic worms that live in the heart, lungs, and associated blood vessels, this disease can lead to severe lung damage, heart failure, and other complications if left untreated. Understanding the causes, symptoms, treatment options, and prevention methods can help pet owners protect their dogs and support their long-term health. What Causes Heartworm Disease in Dogs? Heartworm disease is caused by Dirofilaria immitis, a parasitic worm transmitted through the bite of an infected mosquito. When a mosquito carrying infective heartworm larvae bites a dog, the larvae enter the body and gradually mature into adult worms. Over several months, these worms can travel through the bloodstream and settle in the heart, lungs, and pulmonary arteries. Adult heartworms may grow to approximately a foot long and can survive in a dog's body for several years. Dogs of all b...