Vectra 3D is suppose to keep fleas and ticks off without them having to bite. I used that for Taggart while we lived in upstate New York and I never had any problems with fleas or ticks. I've actually never once picked one single tick from any of my animals or ever dealt with fleas, haha. But that is mostly because I've only lived in America for two years and in the Faroe Islands there simply aren't any ticks or fleas! Only time I've ever seen a flea was one I found on Taggart while we lived in NY. And that flea was already paralyzed, so the product did what it promised. It basically paralyses the pests as soon as they come in contact with the fur. I'm not saying the product is flawless though. I only used it for a year and when I tried to get it over here in California, every vet I called either hadn't heard of it, or they had stopped carrying it because they found it ineffective... So yeah, I dunno. It's kinda difficult to get since you have to get it directly from a vet.

Right now I use Canine Advantix (which doesn't repel but only kills when they bite) and so far it's been working fine and we haven't had any problems.

Anyway. Maybe you could give Vectra 3D a shot. But it is a pesticide, just like frontline and advantix, so maybe Freedom's suggestion would be worth trying first!

Here is the website btw
http://www.vectrapet.com/