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.
1. Heartworm incidence. The life cycle of heartworm is dependent on a temperature that remains above 57F (14C) for at least 45 days straight and at least two weeks of temperatures over 80F (26C). If these conditions are not fulfilled, the parasite cycle cannot be completed and your dog is safe.