I was reading a 'Dog Fancy' magazine and came upon a page for "vectra 3D". It is a Flea, tick, mosquitoe, mite, lice, sand flea and biting flea prevention. My questions are - does anyone here use it? what IS it? How often do you have to buy it? I'm going to ask our vet, but since Im so curious about it, I wanted to post here to see if anyone here has ever heard of it/uses it, as this is the first I've ever heard of it. This is what the page reads: "Vectra 3D repels and kills Fleas, ticks, mosquitoes, mites, lice, sand fleas and biting fleas. By killing these hungry vectors BEFORE they bite and feed, vectra 3D helps to reduce risk of disease transmission. It also prevents flea infestations by controlling all stages of fleas. You don't get this kind of protection in other products. Ask your veterinarian about keeping your dog off the dinner menu with vectra 3D"