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.
My pup had his first heartworm tablets at 13 weeks old. However, you shouldnt give a dog over the age of 6 months any heart worm tablets etc if he hasnt first been heart worm checked as it is possible for dogs to die if they are given heart worm medication and they already have heartworm. lys Â· 8 years ago.Thumbs up.2. Thumbs down.owever, you shouldnt give a dog over the age of 6 months any heart worm tablets etc if he hasnt first been heart worm checked as it is possible for dogs to die if they are given heart worm medication and they already have heartworm. lys Â· 8 years ago. Thumbs up. 2. Thumbs down.