Same here, they're both on Heartguard but nothing else. My Mom uses nematodes in the yard (still have no idea what the heck this is... but it apparently works) because it's over 1 acre and the back is woodsy. I give them garlic supps here and there, and if I find a tick anywhere I have frontline just in case. Last year I saw a few ticks where I walked Gonzo, so he was on Frontline all season and he didn't have a single flea or tick.