I always use frontline for my guys. It doesn't just help prevent the fleas, but does help with the ticks, since I live out in wooded areas by a national park. I found a dog some years back in the woods that was wondering lost. She was covered in ticks completely. Full ticks, so they have been there awhile. I applied frontline to her and they were gone within the hour. They started falling off. (had her outside) It was pretty disgusting. I don't like ticks and love to go camping. Haven't had much issues yet anyways with the dogs. I just check myself when I come inside from yard work.