I really want to use something (and less is better) as a tick and heartworm preventative. K9 Advantix claims to repel and kill ticks, fleas, mosquitoes and biting flies. Fleas and biting flies are not of huge concern to me but ticks (Lyme disease) and mosquitoes (heartworm) are. I just don't like using lots of chemicals. I've reads lots of good reviews on K9 Advantix as a flea/tick preventative but wonder how effective it is as a heartworm preventative. Have any of you who live is mosquito areas used just K9 Advantix with good results?