We will dispense a chewable heartworm prevention tablet for your kitten. Heartworms are parasites that are spread by mosquitoes and they are prevalent in this area. Heartgard not only protects against heartworms, but also hookworms, which can affect humans, especially children. As your kitten grows we will prescribe a dose of medication appropriate for their weight. Heartgard should be given monthly on a year round basis.