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.
Cost of Heartworms in Dogs. Heartworms can be an expensive treatment in dogs and can range from $173.00 to $301.00 depending on the cost of living and severity of your Dog's heartworms. On average, the national cost of treating heartworms in dogs is $237.47.