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.
Symptoms of heartworm disease may take more than 6 months to appear. By: Josh. Heartworm disease in dogs is a silent killer that is often overlooked until itâs too late. This preventable condition starts with a mosquito bite and ends with either a long, expensive treatment or death. Symptoms may not appear until the worm reaches maturity (usually after around 6 months).