I'm curious to know how many people use these products? Dousing a dog in pesticides for its life seems dangerous...on the other hand, dealing with heart worm or lyme disease also seems scary. My roommate and I are both leaning towards not using this stuff...my roommy is from serbia and knows very old dogs who've been fed raw and given none of these treatments and they live until very old age. Some opinions from users of this forum would be great.