What if my cat eats mice that have been in contact with the bait box?

It takes very little insecticide to control ticks on a small rodent, and the insecticide used in the bait box is an extremely low dose insecticide. The concentration of fipronil on the wicks that the mice move through in the bait box is 0.7% fipronil. The concentration of fipronil in the commonly used, veterinarian recommended flea and tick control (e.g. Frontline®) is 9.8% fipronil. Therefore, the concentration of fipronil used in the bait boxes is 10 times less than the concentration found in commonly used topical flea and tick control products for household pets.