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   What is Heartworm Anyway?Heartworms are parasites that, in their adult form, pose a serious threat to dogs. The worm-like parasites can infest an animal’s heart and the large arteries that go to its lungs. The heartworm larvae is carried by mosquitoes, which transmit it to dogs by biting them. Spring and summer, when mosquitoes are most active, are therefore often thought of as heartworm season. But in some areas of the country, heartworm is a risk all year long. If a dog does develop heartworm, he will cough, lose weight, and tire easily. Ultimately, the disease can be fatal. But fortunately, it’s also preventable. If your pet is susceptible to heartworm, your veterinarian will likely suggest monthly medication to protect him. -Dr. Larry McDaniel, DVM for the "Purina® Animal Instincts" Podcast Series
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