5. Address the envelope. In the lower right third of the envelope, write the name of the person you are sending the letter to. Write the company name on the line below that (if there is a company name).
Once inside a new host, it takes approximately 6 months for the larvae to mature into adult heartworms. Once mature, heartworms can live for 5 to 7 years in dogs and up to 2 or 3 years in cats. Because of the longevity of these worms, each mosquito season can lead to an increasing number of worms in an infected pet.
Heartworm disease is a dangerous, but preventable infection where parasitic worms grow inside the chambers of your dog or cat's heart and large blood vessels. Left undetected, heartworm disease can become serious and even result in death as worms eventually block blood flow to the heart and lungs.