Have been using Google Frontline plus for over 3 months now and it's like I'm not using anything on my dog. This product is not doing anything it claims to do. This was the first time I have used Frontline on my pet and will be the last. I have been unable to contact Frontline at all. They won't return calls or messages. They have blocked anyone from commenting on their Facebook page for this very reason I assume. Do yourself a favor if you're reading glasses this and go with K9 Advantix or some other product. Water works better than Frontline.