Here is Missouri we have had an usually wet summer. (I haven't had to water anything yet.) Have you had an unusually wet summer too? That may have promoted the growth of fleas around your place.

There are many species of fleas with differing life cycles. They can live in cracks in the floor, inside upholstered furniture and behind the woodwork. (Anywhere dark.) Once they take over, the amount of work to get rid of them is staggering.

I suggest you bite the bullet and have a professional spray your place. Then return to the use of Frontline.