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 Heartworms are worms that live in the right side of the heart of dogs and cats. 2  Heartworms are carried by mosquitos and the mosquitos transfer the baby heartworms from one dog to another dog or cat when it bites them. 3  The worms can be 6-18 inches long and resemble a thin spaghetti noodle. Your dogâs adult heartworms should now be all killed with the completion of Heartworm Treatment Part 1. 2  Heartworm Treatment Part 2 will now kill the baby heartworms called Microfilaria, which live and circulate in the bloodstream.