Dr. Faught and Mabel from Firehouse Animal Health Center in Austin Texas discuss the importance of heartworm screening. A heartworm is a parasitic worm that travels through the blood to the heart where it will live. It is a very serious disease seen in pets, and can be fatal. In Texas your pet should be on heartworm prevention all year round. If you have any questions for Dr. Faught then sent your video question to AskTheVet@KXAN.com. Hope to hear from you soon!