Frontline Plus is the #1 item in Amazon's flea drops category - and for good reason. It frequently receives rave reviews for its effectiveness. Here is a review from an Amazon customer:
"My dog is a Chow mix and very furry. Ticks are impossible to find under her two layered coat until it's too late. At first, I tried cheaper brands. They work on ticks but do nothing for fleas. Then my vet recommended Frontline. I later tried K9 Advantix since they claim to also kill mosquitos, but I didn't notice any difference with the little bloodsuckers. And the protection from K9 Advantix didn't seem to last as long so I switched back to Frontline.
Frontline works great for us. My dog is an outdoor dog and our county reportedly has more deer than people. And with deer come deer ticks. I've seen deer in my back yard and my dog's house is very near the woods for shade. And she likes to take the occasional jaunt through the woods. Still I rarely find a tick on her. And when I do, they're usually dead (or soon will be).
I wish I'd known Amazon was selling Frontline for a better price sooner. I've been purchasing only 3 months worth for about $50 from another site for the last 2 years. Very frustrating since before you know it, you're out. With 6 months worth I only have to remember 2 times a year instead of 4."
Source: http://www.amazon.com/Merial-Frontline-Control-88-Pound-Applicators/