Heartworm protection for dogs in the United States is an essential aspect of responsible pet care, as heartworm disease can cause severe and potentially fatal damage to a dog’s heart, lungs, and blood vessels. Effective protection typically involves regular testing and the use of preventive medications recommended by a veterinarian. These preventives work by targeting the immature stages of the parasite before they develop into harmful adult worms. Because the disease is transmitted through mosquito bites, year-round prevention is strongly advised, especially in regions with warm climates or high mosquito populations, to ensure dogs remain healthy and protected throughout the year.