Wondercide Flea & Tick Spot On is a scientifically formulated solution that repels bugs and provides an additional layer of protection against fleas, ticks, and mosquitoes for up to 1 month. Each box contains 3 tubes, providing a 3-month supply for your pet. With options for both cats and dogs, Spot On comes in one strength for small pets (under 35 lbs), medium pets (35-75 lbs), and large pets (over 75 lbs). Please note, while Spot On does not kill bugs, it is an effective preventative measure. For complete bug elimination, use Flea & Tick sprays for pets, home, and yard as directed.