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.
Did you know? 1  If left untreated, heartworm disease can result in your dog's death. 2  Heartworms can grow to 16 inches in length and there can be as many as 250 heartworms in a dog's vital organs. 3  Your dog can have no symptoms until heartworms are well-established. 4  Almost 300,000 dogs in the U.S. are infected with heartworms each year. 5  It is 6  ... Other If left untreated, heartworm disease can result in your dog's death. 2  Heartworms can grow to 16 inches in length and there can be as many as 250 heartworms in a dog's vital organs. 3  Your dog can have no symptoms until heartworms are well-established.