Try switching to K9 Advantix II from Bayer, a bit expensive but works for ticks, fleas, deer flies, lice and skeeters; repels and kills any that might get thru the repel stage. Will also kill cats if used on them. They now have some ingestible stuff, that I rather not use.
The Frontline will affect ticks before they attach; the problem is that the little dog, a terrier/papillion/? mix, has long hair and an almost non existent ground clearance, worse when he squats to defecate. We trim the fur on his under belly and feet, but ticks that crawl aboard can end up in the house as soon as he's back inside, and aren't on the surface of 3-inch-long haircoat long enough to be affected by preventative treatment.
The big dog (lab/pit mix) is short haired, so boarding area is mostly feet and head, where ticks not easily seen on black fur. I usually find them by touch. The ticks often aren't on the dogs long enough to attach.
We live on a main road, our dogs are never off-leash, only on mowed areas. Even so, when ticks are abundant, we find some on furniture after we or the mutts are outside.
Even with Frontline Plus for them and repellant/laundry strategies, frequent vacuuming, sometimes they end up on us.
Life in south Jersey; as Sue said, "Brace yourselves" !