Ticks

I just must be a tick magnet! Every time I go outside, I come back in to find at least one on me, and usually 3-4. But I have never seen any on my dogs. All short haired, so it would be easily found, so what gives? Any help for keeping the ticks off? I use insect spray regularly, because I live in bug hell. Biting gnats, deer flies, mosquitos, etc. but the repellant doesn't seem to affect the ticks.