Heartworm prevention is essential for pets, particularly dogs and cats, as it protects them from a serious and potentially fatal disease caused by Dirofilaria immitis, a parasitic worm transmitted by mosquitoes. Regular use of preventive medications, available in various forms such as pills, topical treatments, or injections, helps ensure that pets remain heartworm-free. Veterinarians recommend starting heartworm prevention at a young age and continuing it year-round, even in colder months when mosquitoes are less active. Routine testing for heartworm is also advised to catch any infections early, allowing for effective treatment and safeguarding your pet's health.